George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

A mysterious castle built as a monument to lost love.

The Origin of On the Origin of Species.

The "dragon babies" of southeastern Europe.

Eccentric stone cairns built on a public New York City beach.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The final resting place of the Emperor of the United States and Protector of Mexico.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The Uros people live on floating reed islands in lake Titicaca.

Thousands of well-dressed mummies below a monastery.

A store that sells all manner of bones, insects, and animal curiosities.

Home of Jake the Alligator Man, the mummified remains of a cigar smoking, cross-dressing celebrity of the Northwestern coast.

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

Deep scars on the earth left by the Ice Age.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

Hungarian mummies in beautiful painted coffins.

A museum dedicated to "science, history and the arts" little changed since 1915.

The world's largest rotating world.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

More than 5,000 contemporary and "historic" mustards from around the world.

Half of a waterfall goes into the river while the other half seems to disappear.