Was this cave created by Hercules's wrath, the devil, or volcanic activity?

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Bathe in these natural hot springs located high in the Andes Mountains.

This entire town moved to a safe location after it was devastated by an earthquake, but the remains of the original town are still around.

These ruins of a Phoenician sanctuary in Sicily have a dark history.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

The tomb of history's greatest potato promoter is surrounded by tubers.

This trail follows unique stone railroad tracks and a historic waterway to the south coast of Devon.

A unique hanging cable-car navigates through Dresden, the oldest suspension railway in the world.

This "floating railway" is one of the world's oldest monorail systems.

Once the most densely populated place in the world, this island is now a ghost town.

A beautiful final resting place for some of the noteworthy deceased.

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

The best-preserved ancient theater in the world.

This region of Slovakia boasts some of the most plentiful opal mines in the world.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

A gorgeous stone viaduct crosses over a bucolic valley.

An abandoned 19th-century iron factory perched along the outskirts of an idyllic village.

Too much gossip or just missing curfew could land you in here for a couple of days.

After 11 years of reconstruction work, Slovakia's finest hilltop chapel complex is finally reopen to the public.

An unusual cave filled with rare alien-looking aragonite formations.

Climb around the high waterfalls on series of iron ladders and bridges within the wildest gorge in the Slovak Paradise.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."