Galle Fort

This replica of a 16th-century French settlement memorializes one of the earliest attempts at a European settlement in North America.

A nearly impregnable 16th-century fort is one of Goa's oldest.

This 17th-century Portuguese fort now houses a nautical museum.

This 17th-century fort, built by the Dutch to control a piece of the international spice trade, is now a city park.

This colorful gate stands as an entrance to the walled city of Old San Juan.

A colonial-era fort with panoramic views across the border of Timor-Leste, now home to a hotel.

Haunted by its violent past, this colonial bastion was the largest Spanish military installation in the Americas.

This ruined fort and statue are a testament to the last king of Kaua‘i’s savvy diplomacy skills, which briefly brought Russians to Hawai‘i.