This 16th-century pole was once used in brutal public executions.

A stunning Art Nouveau cinema in the heart of Budapest.

The lost library of Alexandria, revived as a spearhead of cultural preservation.

An explosion of natural color known as "the river that ran away from paradise."

A fantastical bed and breakfast with magically unique rooms.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

At low tide, you can see the remains of a 17th-century ship just off a Stockholm island.

This tombstone marks the spot where the legendary British spy met his end.

A monument dedicated to a lone, brave invader.

A 100-year-old Japanese command center is now a unique underground university walkway with periodic exhibits.

The burial place of one the greatest Arthurian authors, with the sword in the (grave)stone.

Aboriginal artists carved these unique figures into sandstone.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

This island hill is strewn with boulders carved by shipwreck victims from the age of sail.

Italian horror legend Dario Argento’s own shop hides a sinister museum-dungeon in the basement.

Spend the night in this former asylum for the incurably insane, which claims to be one of the most haunted places in the United States.

This bizarre residential building is the masterpiece of Von Jour Caux, the “Gaudí of Japan.”

This restaurant serves wood-fired fare served in a natural cave with a live spring.

Renowned restaurant tucked in a cave once occupied by buccaneers.

Drink and dine in a coral cave that's at least 120,000 years old.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

On the side of Christchurch Mansion is an enigmatic block of dark limestone that dates back to 14th-century Belgium.

The rusting hulk of a hand-powered, nearly 160-year-old submarine abandoned in 1869 due to the ravages of decompression sickness.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.