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Circular Fort Necessity
Pennsylvania, USA
El Morro #2
San Juan, Puerto Rico
Octagonal Blockhouse
Fort George, Canada

Magnificent Donjon
Himeji-jo, Japan
Scotts Head
Dominica, Caribbean
Fort Chambly #3
Quebec, Canada

Defensive Walls
Royal Naval Dockyard, Bermuda
Matazas Bay
St. Augustine, Florida, USA
Kitchen in Fort Christian
St Thomas, US Virgin Islands