diff --git a/src/components/ImageLightbox.tsx b/src/components/ImageLightbox.tsx
new file mode 100644
index 0000000..ed9af86
--- /dev/null
+++ b/src/components/ImageLightbox.tsx
@@ -0,0 +1,131 @@
+import { useCallback, useEffect } from 'react';
+import { ChevronLeft, ChevronRight, Users } from 'lucide-react';
+import {
+  Dialog,
+  DialogContent,
+  DialogTitle,
+  DialogDescription,
+} from '@/components/ui/dialog';
+import { Button } from '@/components/ui/button';
+import { ImageWithFallback } from '@/components/ImageWithFallback';
+
+export interface LightboxImage {
+  url: string;
+  caption?: string;
+  /** Owner-uploaded images carry no "Community" badge. */
+  isOwner?: boolean;
+}
+
+interface ImageLightboxProps {
+  images: LightboxImage[];
+  /** Index of the open image, or null when closed. */
+  index: number | null;
+  onIndexChange: (index: number) => void;
+  onClose: () => void;
+}
+
+/**
+ * Full-screen photo viewer for spot/shop galleries.
+ *
+ * Detail-page grids previously rendered images that did nothing on click and
+ * showed at most five of them. This lets users view every photo at full size,
+ * with arrow-key / button navigation. Images come from arbitrary Blossom hosts,
+ * so it reuses ImageWithFallback to degrade gracefully on dead URLs.
+ */
+export function ImageLightbox({ images, index, onIndexChange, onClose }: ImageLightboxProps) {
+  const open = index !== null && index >= 0 && index < images.length;
+  const current = open ? images[index as number] : undefined;
+
+  const go = useCallback(
+    (delta: number) => {
+      if (images.length === 0) return;
+      const base = index ?? 0;
+      onIndexChange((base + delta + images.length) % images.length);
+    },
+    [images.length, index, onIndexChange],
+  );
+
+  useEffect(() => {
+    if (!open) return;
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === 'ArrowLeft') {
+        e.preventDefault();
+        go(-1);
+      } else if (e.key === 'ArrowRight') {
+        e.preventDefault();
+        go(1);
+      } else if (e.key === 'Escape') {
+        e.preventDefault();
+        onClose();
+      }
+    };
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [open, go, onClose]);
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => { if (!o) onClose(); }}>
+      <DialogContent className="max-w-5xl w-[calc(100%-1rem)] p-0 gap-0 bg-black/95 border-white/10 overflow-hidden">
+        <DialogTitle className="sr-only">{current?.caption || 'Photo'}</DialogTitle>
+        <DialogDescription className="sr-only">Photo viewer</DialogDescription>
+
+        {current && (
+          <div className="relative flex flex-col">
+            <div className="flex items-center justify-center bg-black">
+              <ImageWithFallback
+                src={current.url}
+                alt={current.caption || 'Photo'}
+                className="max-h-[80vh] max-h-[80dvh] w-auto max-w-full object-contain"
+              />
+            </div>
+
+            {/* Position counter */}
+            <div className="absolute top-3 left-3 rounded bg-black/70 px-2 py-1 text-xs font-mono text-white/90">
+              {(index as number) + 1} / {images.length}
+            </div>
+
+            {/* Prev / next */}
+            {images.length > 1 && (
+              <>
+                <Button
+                  type="button"
+                  size="icon"
+                  variant="ghost"
+                  aria-label="Previous photo"
+                  onClick={() => go(-1)}
+                  className="absolute left-2 top-1/2 h-11 w-11 -translate-y-1/2 rounded-full bg-black/50 text-white hover:bg-black/80 hover:text-white"
+                >
+                  <ChevronLeft className="h-6 w-6" />
+                </Button>
+                <Button
+                  type="button"
+                  size="icon"
+                  variant="ghost"
+                  aria-label="Next photo"
+                  onClick={() => go(1)}
+                  className="absolute right-2 top-1/2 h-11 w-11 -translate-y-1/2 rounded-full bg-black/50 text-white hover:bg-black/80 hover:text-white"
+                >
+                  <ChevronRight className="h-6 w-6" />
+                </Button>
+              </>
+            )}
+
+            {/* Caption / attribution */}
+            {((current.caption ?? '') !== '' || current.isOwner === false) && (
+              <div className="absolute bottom-0 left-0 right-0 bg-gradient-to-t from-black/95 to-transparent px-4 pb-4 pt-8">
+                {current.caption && (
+                  <p className="break-words text-sm text-white">{current.caption}</p>
+                )}
+                {current.isOwner === false && (
+                  <span className="mt-1 inline-flex items-center gap-1 text-xs text-[#ccff00]">
+                    <Users className="h-3 w-3" /> Community photo
+                  </span>
+                )}
+              </div>
+            )}
+          </div>
+        )}
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/src/pages/SpotDetailPage.tsx b/src/pages/SpotDetailPage.tsx
index 98c856a..3be657e 100644
--- a/src/pages/SpotDetailPage.tsx
+++ b/src/pages/SpotDetailPage.tsx
@@ -5,6 +5,7 @@ import { useQueryClient } from '@tanstack/react-query';
 import ngeohash from 'ngeohash';
 import { Layout } from '@/components/Layout';
 import { ImageWithFallback } from '@/components/ImageWithFallback';
+import { ImageLightbox, type LightboxImage } from '@/components/ImageLightbox';
 import { SpotMap } from '@/components/SpotMap';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
@@ -134,6 +135,7 @@ export default function SpotDetailPage() {
   const [showReportDialog, setShowReportDialog] = useState(false);
   const [showStatusDialog, setShowStatusDialog] = useState(false);
   const [showRouteDialog, setShowRouteDialog] = useState(false);
+  const [lightboxIndex, setLightboxIndex] = useState<number | null>(null);
 
   const isOwner = user && spot && user.pubkey === spot.pubkey;
   const isAdmin = isAdminPubkey(user?.pubkey);
@@ -160,6 +162,12 @@ export default function SpotDetailPage() {
   // npub for linking to the mapper's profile / messaging them
   const mapperNpub = spot?.pubkey ? nip19.npubEncode(spot.pubkey) : '';
 
+  // Full photo gallery: owner photos first, then community contributions.
+  const galleryImages: LightboxImage[] = [
+    ...(spot?.images ?? []).map((url) => ({ url, isOwner: true })),
+    ...(communityPhotos ?? []).map((p) => ({ url: p.url, isOwner: false, caption: p.caption ?? undefined })),
+  ];
+
   const coordinates = useMemo(() => {
     if (!spot?.geohash) return null;
     const { latitude, longitude } = ngeohash.decode(spot.geohash);
@@ -248,51 +256,68 @@ export default function SpotDetailPage() {
         <div className="grid grid-cols-1 lg:grid-cols-3 gap-8">
           {/* Main Content */}
           <div className="lg:col-span-2 space-y-6 min-w-0">
-            {/* Image Gallery - Combines owner photos + community photos */}
-            {(() => {
-              const allImages = [
-                ...spot.images.map(url => ({ url, isOwner: true })),
-                ...(communityPhotos || []).map(p => ({ url: p.url, isOwner: false, caption: p.caption })),
-              ];
-              
-              return allImages.length > 0 ? (
-                <>
-                  <div className="aspect-video rounded-xl overflow-hidden bg-muted relative">
-                    <ImageWithFallback
-                      src={allImages[0].url}
-                      alt={spot.title}
-                      className="w-full h-full object-cover"
-                    />
-                    {!allImages[0].isOwner && (
-                      <div className="absolute bottom-2 left-2 px-2 py-1 bg-black/70 rounded text-xs text-[#ccff00] flex items-center gap-1">
-                        <Users className="h-3 w-3" />
-                        Community
-                      </div>
-                    )}
-                  </div>
-                  
-                  {/* Additional images */}
-                  {allImages.length > 1 && (
-                    <div className="grid grid-cols-4 gap-2">
-                      {allImages.slice(1, 5).map((img, idx) => (
-                        <div key={idx} className="aspect-square rounded-lg overflow-hidden bg-muted relative">
-                          <ImageWithFallback src={img.url} alt={`${spot.title} ${idx + 2}`} className="w-full h-full object-cover" />
-                          {!img.isOwner && (
-                            <div className="absolute bottom-1 left-1 px-1.5 py-0.5 bg-black/70 rounded text-[10px] text-[#ccff00] flex items-center gap-0.5">
+            {/* Image Gallery - owner photos + community photos; click to view full size */}
+            {galleryImages.length > 0 ? (
+              <>
+                <button
+                  type="button"
+                  onClick={() => setLightboxIndex(0)}
+                  className="group relative aspect-video w-full cursor-zoom-in overflow-hidden rounded-xl bg-muted"
+                  aria-label="View photo full screen"
+                >
+                  <ImageWithFallback
+                    src={galleryImages[0].url}
+                    alt={spot.title}
+                    className="h-full w-full object-cover transition-transform duration-300 group-hover:scale-[1.02]"
+                  />
+                  {galleryImages[0].isOwner === false && (
+                    <div className="absolute bottom-2 left-2 flex items-center gap-1 rounded bg-black/70 px-2 py-1 text-xs text-[#ccff00]">
+                      <Users className="h-3 w-3" />
+                      Community
+                    </div>
+                  )}
+                </button>
+
+                {/* Additional images */}
+                {galleryImages.length > 1 && (
+                  <div className="grid grid-cols-4 gap-2">
+                    {galleryImages.slice(1, 5).map((img, idx) => {
+                      const realIndex = idx + 1;
+                      const remaining = galleryImages.length - 5;
+                      return (
+                        <button
+                          key={`${img.url}-${realIndex}`}
+                          type="button"
+                          onClick={() => setLightboxIndex(realIndex)}
+                          className="relative aspect-square cursor-zoom-in overflow-hidden rounded-lg bg-muted"
+                          aria-label={`View photo ${realIndex + 1} of ${galleryImages.length}`}
+                        >
+                          <ImageWithFallback
+                            src={img.url}
+                            alt={`${spot.title} ${realIndex + 1}`}
+                            className="h-full w-full object-cover"
+                          />
+                          {img.isOwner === false && (
+                            <div className="absolute bottom-1 left-1 flex items-center gap-0.5 rounded bg-black/70 px-1.5 py-0.5 text-[10px] text-[#ccff00]">
                               <Users className="h-2.5 w-2.5" />
                             </div>
                           )}
-                        </div>
-                      ))}
-                    </div>
-                  )}
-                </>
-              ) : (
-                <div className="aspect-video rounded-xl bg-gradient-to-br from-primary/20 to-accent/20 flex items-center justify-center">
-                  <MapPin className="h-16 w-16 text-primary/40" />
-                </div>
-              );
-            })()}
+                          {idx === 3 && remaining > 0 && (
+                            <div className="absolute inset-0 flex items-center justify-center bg-black/70 text-sm font-bold text-white">
+                              +{remaining}
+                            </div>
+                          )}
+                        </button>
+                      );
+                    })}
+                  </div>
+                )}
+              </>
+            ) : (
+              <div className="flex aspect-video items-center justify-center rounded-xl bg-gradient-to-br from-primary/20 to-accent/20">
+                <MapPin className="h-16 w-16 text-primary/40" />
+              </div>
+            )}
 
             {/* Spot Info */}
             <div className="space-y-4">
@@ -1043,6 +1068,14 @@ export default function SpotDetailPage() {
         destination={coordinates}
         destinationLabel={spot?.title ?? 'Spot'}
       />
+
+      {/* Full-screen photo viewer */}
+      <ImageLightbox
+        images={galleryImages}
+        index={lightboxIndex}
+        onIndexChange={setLightboxIndex}
+        onClose={() => setLightboxIndex(null)}
+      />
     </Layout>
   );
 }