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

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A fairy tale castle in modern Rome.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

A ruined hotel with an unlucky history and an eerie present.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.

Singapore's landscaping project is home to 18 incredible Supertrees.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Concrete balls on wires constructed to stop train surfing in Indonesia.

Home to more than 13,000 pieces of war memorabilia and military equipment.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

42nd story Pyramid shaped penthouse tops Seattle's oldest skyscraper.

A wall of chewing gum moonlights as collective art.

Part bookstore, part café, and part forest.

Concrete construction materials turned into a fashionable capsule hotel in rural Mexico.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.