Virgil's many-mouthed gateway to the underworld.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

A tunnel of hardened lava along Maui’s famous Road to Hana.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A Turkish ghost town abandoned in a population exchange with Greece.

A 200-year-old collection of oddities and medical paraphernalia.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Bermuda triangle lighthouse, site of mysterious disappearances, left to crumble into the Atlantic.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

This small chapel is built of human bones and decorated with a golden skeleton.

Eternal resting place of the grave robber and murderer who served as inspiration for many of cinema’s famous madmen.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

Dim sum, served in a grand old theater.

A 16th-century horror show built in a lovely Italian garden.

The ancient tomb acts as a calendar that keeps perfect time.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

An ancient Viking village in North America that predates Columbus by 500 years.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The curious and tiny collection contains some very odd objects.

Former headquarters of the KGB.

A village on the east coast of England that has almost completely eroded into the North Sea.

Two small chapels housed inside an ancient tree.