This huge dam across the Colorado River caused an armed standoff between two U.S. states.

A reproduction of earth's many biomes.

This church on a Tohono O'Odham reservation has stood since 1797.

America's only nuclear missile silo open to the public.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This giant steer-skull edifice refuses to die.

Limestone caves with spectacular showcase chambers.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

The empty tomb that houses the memories of Roy Bertelli's revenge.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The first spinning jail built in the United States is the only one that still turns.

An eclectic collection of wind-powered sculptures made from found and recycled materials.

Every drop of water in this 27-mile long reservoir was pumped up from the Columbia River using power from Grand Coulee Dam.

Site of the greatest known waterfall that ever existed.

People come from across the globe to swim in this lake believed to have healing properties.

After being lost for decades, this striking mural depicting the atomic bomb covers the wall of a busy Tokyo metro station.

Although damaged beyond recognition, this stone god is still said to bring good luck to those who tap on him with a pebble.

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

Weighing nearly 7 tons, this massive sculpture was carved out of 500-year-old wood and decorated with thousands of jewels.

Mythical beasts symbolizing the city of Tokyo guard a historic bridge.

This enormous monument is one of the most iconic structures in Tokyo, rudely nicknamed "The Golden Turd."

Only the face remains of this giant Buddha statue, which is said to be a source of luck for students.

A Buddhist temple on an artificial island that houses a monument to the fugu fish.