diff --git a/app/Http/Controllers/Api/CityController.php b/app/Http/Controllers/Api/CityController.php
index b17573e..d637fa7 100644
--- a/app/Http/Controllers/Api/CityController.php
+++ b/app/Http/Controllers/Api/CityController.php
@@ -30,10 +30,13 @@ class CityController extends Controller
      */
     #[QueryParameter(name: 'search', description: 'Teilstring-Suche im Namen der Stadt.', required: false, type: 'string')]
     #[QueryParameter(name: 'selected', description: 'Lädt gezielt die angegebenen IDs.', required: false, type: 'array')]
+    #[QueryParameter(name: 'withDetails', description: 'Presence-Flag: liefert zusätzlich Country-Code und Flaggen-URL und hebt die Begrenzung auf 10 Einträge auf.', required: false, type: 'string')]
     public function index(Request $request)
     {
+        $withDetails = $request->exists('withDetails');
+
         return City::query()
-            ->with(['country:id,name'])
+            ->with([$withDetails ? 'country:id,name,code' : 'country:id,name'])
             ->select('id', 'name', 'country_id')
             ->orderBy('name')
             ->when(
@@ -44,9 +47,16 @@ class CityController extends Controller
             ->when(
                 $request->exists('selected'),
                 fn (Builder $query) => $query->whereIn('id', $this->numericIds($request)),
-                fn (Builder $query) => $query->limit(10)
+                fn (Builder $query) => $withDetails ? $query : $query->limit(10)
             )
-            ->get();
+            ->get()
+            ->map(function (City $city) use ($withDetails) {
+                if ($withDetails) {
+                    $city->flag = asset('vendor/blade-country-flags/4x3-'.$city->country->code.'.svg');
+                }
+
+                return $city;
+            });
     }
 
     /**
diff --git a/app/Http/Controllers/Api/VenueController.php b/app/Http/Controllers/Api/VenueController.php
index 00ef62b..229b213 100644
--- a/app/Http/Controllers/Api/VenueController.php
+++ b/app/Http/Controllers/Api/VenueController.php
@@ -32,6 +32,7 @@ class VenueController extends Controller
      */
     #[QueryParameter(name: 'search', description: 'Teilstring-Suche im Namen des Veranstaltungsortes.', required: false, type: 'string')]
     #[QueryParameter(name: 'selected', description: 'Lädt gezielt die angegebenen Veranstaltungsort-IDs (umgeht die Begrenzung auf 10 Einträge).', required: false, type: 'array')]
+    #[QueryParameter(name: 'withDetails', description: 'Presence-Flag: hebt die Begrenzung auf 10 Einträge auf.', required: false, type: 'string')]
     public function index(Request $request)
     {
         return Venue::query()
@@ -46,7 +47,7 @@ class VenueController extends Controller
             ->when(
                 $request->exists('selected'),
                 fn (Builder $query) => $query->whereIn('id', $this->numericIds($request)),
-                fn (Builder $query) => $query->limit(10)
+                fn (Builder $query) => $request->exists('withDetails') ? $query : $query->limit(10)
             )
             ->get()
             ->map(function (Venue $venue) {
diff --git a/tests/Feature/Api/CityVenueReadApiTest.php b/tests/Feature/Api/CityVenueReadApiTest.php
new file mode 100644
index 0000000..c5282b0
--- /dev/null
+++ b/tests/Feature/Api/CityVenueReadApiTest.php
@@ -0,0 +1,50 @@
+<?php
+
+use App\Models\City;
+use App\Models\Country;
+use App\Models\Venue;
+
+it('limits GET /api/cities to 10 entries without withDetails', function () {
+    City::factory()->count(11)->create(['country_id' => Country::factory()->create()->id]);
+
+    $this->getJson('/api/cities')
+        ->assertSuccessful()
+        ->assertJsonCount(10);
+});
+
+it('returns all cities with country code and flag on GET /api/cities?withDetails', function () {
+    $cities = City::factory()->count(11)->create(['country_id' => Country::factory()->create()->id]);
+
+    $response = $this->getJson('/api/cities?withDetails')
+        ->assertSuccessful()
+        ->assertJsonCount(11);
+
+    $first = collect($response->json())->firstWhere('id', $cities->first()->id);
+
+    expect($first)
+        ->toHaveKeys(['id', 'name', 'country_id', 'country', 'flag'])
+        ->and($first['country'])->toHaveKeys(['id', 'name', 'code'])
+        ->and($first['flag'])->toContain('4x3-'.$cities->first()->country->code.'.svg');
+});
+
+it('limits GET /api/venues to 10 entries without withDetails', function () {
+    Venue::factory()->count(11)->create(['city_id' => City::factory()->create()->id]);
+
+    $this->getJson('/api/venues')
+        ->assertSuccessful()
+        ->assertJsonCount(10);
+});
+
+it('returns all venues on GET /api/venues?withDetails', function () {
+    $venues = Venue::factory()->count(11)->create(['city_id' => City::factory()->create()->id]);
+
+    $response = $this->getJson('/api/venues?withDetails')
+        ->assertSuccessful()
+        ->assertJsonCount(11);
+
+    $first = collect($response->json())->firstWhere('id', $venues->first()->id);
+
+    expect($first)
+        ->toHaveKeys(['id', 'name', 'city_id', 'flag', 'description', 'city'])
+        ->and($first['city']['country'])->toHaveKeys(['id', 'name', 'code']);
+});