Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

Volunteer-run library dedicated to exploring five decades of activism history.

Over 120,000 curious objects that have shaped our modern world.

A community of collapsing homes more than a mile out from the Florida coast.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

A secret, rocky playground hidden amongst the plain white beaches of the Florida coast.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

North Central Florida's largest flea market and a weekend roadtripper's dream.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The scuba diving training facility was named for the steam that rises from the cave's chimney.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

Hundreds of glow-in-the-dark objects light up a museum in a historic zinc mine.

This family tattoo parlor has been inking religious pilgrims in the Middle East for 700 years.

This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

A volcanic tunnel illuminated by natural skylights offers a shaded respite from the desert sun.

The crypts are so large they're basically their own underground church.

These concrete domes were installed on an Icelandic bluff to honor a very specific musical tradion.

This plaque tells the story of an event that took place in an imagined parallel universe.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.