One of the largest underground systems runs under Canada's largest urban center.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Greenery cloaks this serene sculpture inspired by the famous Lost Gardens of Heligan.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Hindu temple of the dead home to hundreds of long-tailed macaques.

A tiny church on a man-made island in the Adriatic.

A curious cave church carved into the face of a cliff.

A little sculpture with a large wardrobe.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

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

An alchemist's "magic door" stands in the middle of a Roman park.

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

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

A market for witches is hidden within a train station.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

This one-time health resort was used by aristocrats around the world.

A miniature train-ride through Slovenia's largest cave system.

This massive subterranean fissure is known as the "underground Grand Canyon."

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.