Somewhere beneath the St. Ann’s Fort is a vaulted area housing some of the oldest cannons in the world.
Bullet holes inside the Imperial fortress on Srdj mountain, above the city of Dubrovnik, Croatia.
This old fortress used to be a tourist attraction before the civil war, but in 1991 it was the front line that saw bitter fighting and guarded Dubrovnik from the North.
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The ruined citadel of Koshoy Korgon, is located just outside of the village of Kara-Suu. Not much is known about this fortress (at least according to my guidebooks, anyway) but it dates from roughly the 10th century, and was probably Karakhanid.
Bent's Old Fort National Historic Site was built in 1833 as the only fort along the Santa Fe trail between Missouri and Mexican settlements. It was a place for Cheyennes and Arapaho to trade buffalo hides.