Castle del Monte, by unknown, at Apulia, Italy, 1240 to 1250.

Deal Castle, by unknown, at Kent, England, 1540.

Dover Castle, by unknown, at Dover, England, 1180.

Elphinstone Tower, by unknown, at near Edinburgh, Scotland, UK, 1440.

Himeji Castle, by unknown, at Donjon, Himeji City, Japan, 1601 to 1614.

Mausoleum of Augustus, by unknown, at Rome, Italy, -25.

Mausoleum of Hadrian, by unknown, at Rome, Italy, 135.

Neuschwanstein Castle, by unknown, at Neuschwanstein, Germany, 1869.

Olavinlinna Castle, by unknown, at Savonlinna, Finland, 1562.

Pitfichie Castle, by unknown, at near Aberdeen, Scotland, UK, 1550.

Rait Castle, by unknown, at near Nairn, Scotland, UK, 1300.

San Simeon, by Julia Morgan, at San Simeon, California, 1922 to 1939.

The Alcazar, by unknown, at Segovia, near Madrid, Spain, 1000 or 1410 to 1455.

Tower of London, by unknown, at London, England, 1070 to 1090.

Villa Farnese, by Giacomo Vignola, at Caprarola, near Viterbo, Italy, 1560.