Denmark's famous pseudo-hill.

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

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

Long before guestbooks and hotels, frontier travelers signed their names on this rock face.

Every president in history is immortalized in bronze in downtown Rapid City.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The first declared National Monument in the United States.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This trio of Australian rock spires may have inspired aboriginal legend or just modern tourism.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

Erotic art covers the walls of the largest ancient pleasure palace.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

Petting this mysterious iron monkey supposedly brings good luck.

Largest island in the Baltic Sea experiences such idyllic weather that roses bloom in the middle of December.

A former major munitions plant that has been converted into a sprawling art space.

The largest game reserve in Africa is home to thousands of species but refuses to house humans.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.