A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

The rubbery beast is sculpted from recycled materials.

Professional and amateur dioramas, taxidermy, and oddities all located in an attic above a gallery.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

An abandoned Victorian house transformed into a museum and store filled with taxidermy and vintage goods.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

Ride a boat through this magnificent underground world, which now doubles as a theater.

One of the few places of its kind, this space research center sits deep in the countryside of Matera.

An impressive bridge over a ravine also served as an aqueduct.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

One man's quest to fix his toilet unearthed over 5,000 artifacts spanning more than 2,000 years of history.

A long-buried ancient ruin unearthed right in the middle of the city.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

Southern Italy's spinning top village.

The building where Mary, Queen of Scots was said to have bathed in white wine.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

An impressive armored bronze effigy marks the tomb of one of the medieval era's greatest warriors.