The bottle house obsession struck a Florida man in his retirement, and now he can't stop building.

One of the largest Native American shell middens stands 30 feet tall.

The strip club's VIP lounge is actually a rare repurposed Futuro House.

A small poultry graveyard in the courtyard of a popular Key West watering hole.

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

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

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

It's a pretty creepy lock-up.

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

Florida castle built with aluminum printing plates.

The only Florida state park with publicly accessible caves.

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

A luxuriant botanical garden below sea level.

Town of spiritualists and mediums in Florida.

A giant 400-acre preserve in North Florida for displaced wolves.

A haunted hill that supposedly defied gravity.

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

Arrr! The most authentic collection of pirate artifacts in the world... matey.

Opened in 1976, this monster-sized version of the fast-food franchise is sometimes called the Epic McD.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This concrete church spent a period of its history as a World War II bunker.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.