A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A museum dedicated to restoring vintage aircraft, located at a working airport.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Iconic red and white plaques show the creative names invented to navigate the city streets.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

What looks like a normal building is really a hollow facade hiding a subway vent.

Outposts of this restaurant chain were shaped like jaunty chapeaus.

A herd of colorfully painted bovine statues can be found in the middle of "cowtown."

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

Dubbed the "Blade Runner dragon," this buzzing neon sign is a beloved local icon.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

A "hospital" where people went to be quarantined, die, and be buried in the yard.

A quintet of history museums make this Virginia graveyard as much a resting place for funereal history as it is for people.

The world’s largest combined collection of U.S. and Russian aircraft got its start in a poultry building.

The embalmed remains of the communist leader lie within a custom crystal coffin.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.