Giant disc-shaped gate took 20 men to close off this city in Madagascar.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

Fabulous formations, weird and wonderful wildlife.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

This small island was the first National Wildlife Refuge ever created in the United States.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

It's a pretty creepy lock-up.

Location of a reliquary containing bone fragments of 18 saints.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

Bronze footprints mark the path where a civil rights leader tried to march in peaceful protest before being knocked unconscious.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

A lion given to the prime minister somehow got stuffed and sent to Florida.

Intertwined, interspecies trees which locals believe can grant boons to lovers.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The graves in Florida's oldest Black cemeteries are marked with shells, stones, and mementos of the deceased.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

Gnarled canopies of pink and purple wildflowers arch over the trail to the summit.

North Carolina's only restored fort from the French and Indian War.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.