The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A museum dedicated to the history and exploration of both popular music and science fiction.

A sanctuary for sickly, stray, or wounded donkeys.

Twisted buildings adorn the banks of the Rhine river.

This former steel and coal plant is now a neon-lit industrial fantasia.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

This historic Victorian hotel has a scandalous history of affairs and murder.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

This natural wonder is disappearing at an alarming rate.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

The world's longest covered bridge is a quaint and incredible wooden tunnel.

A mysterious spot where the laws of gravity seem not to apply.