Fort San Felipe del Morro

1600 × 1200

Fort San Felipe del Morro in Puerto Rico

1024 × 768

Fort Jefferson Island

3072 × 2048

Aerial view of a historic fortress

911 × 700

Great Wall of China — Brown, Dramatic, Sunset, Photograph, Mountain, Fortress, Path

2560 × 1920

Aerial View of Coral Island — Blue, Serene, Afternoon, Photograph, Coral Reef, Ocean, Vegetation

1024 × 768

Aerial View of Coral Atoll — Coral Reef

1024 × 768

ancient stone fortress with cannons

1024 × 768

Aerial View of Tropical Island — Blue, Serene, Afternoon, Photograph, Ocean, Clouds, Coral Reef, White

4288 × 2848

Aerial View of Tropical Island — Blue, Serene, Afternoon, Photograph, Ocean, Clouds, Coral Reef

1600 × 1000

Sigiriya Rock Fortress — Green, Serene, Afternoon, Photograph, Forest

2217 × 1710

ancient fortress with mosque

800 × 600