Fort San Felipe del Morro in Puerto Rico

1024 × 768

Fort Jefferson in Florida Keys

1200 × 796

Aerial view of a historic fortress

911 × 700

ancient stone fortress with cannons

1024 × 768

Terracotta Army Soldiers — Brown, Historical, Photograph, Trenches

2816 × 2112

Terracotta Army Soldiers — Brown, Historical, Photograph, Statues

1600 × 1200

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

2560 × 1920

Stone Archway in Fortress

2560 × 1600

Fort at sunset with flags

3840 × 2160

Fortress tower overlooking the ocean

1024 × 765

Khotyn Fortress — Green

1600 × 1200

Ancient Stone Fortress — Blue, Dramatic, Afternoon, Photograph, Ruins

2559 × 1577