These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

This massive crater in the middle of nowhere was used to train astronauts for moon landings.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.

A giant open-air sculpture made of over 200 full-sized boats.

This museum glorifies the humble potato.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Ancient pueblos built into the base of a natural canyon wall.

See massive fossils that are over 200 million years old in northeastern Arizona.

A motel dedicated to Southwestern nostalgia.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

The ancient latrines of the Greeks, in all their public glory.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The world's most active stratovolcano is almost always erupting.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

2300-year-old Roman road connecting the empire.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.