The unusual burial monument of Arizona's first governor.

Opinions differ as to whether this Arizona tree was actually used as a Wild West jail, but that hasn't stopped the town from capitalizing on it.

A mysterious "wedding cake" castle in the middle of the urban desert.

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

A spiritual vortex among the red rocks in Sedona.

Limestone caves with spectacular showcase chambers.

An homage to everyone's favorite prehistoric cartoon family.

Washington's iconic carousel has a nice piece of Civil Rights history.

Go take a picture with the inventor of the daguerreotype photographic process.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Created by one of England's most prolific labyrinth designers, inspired by Bath city history.

A historic Georgian building and warm springs.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

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

A beautiful geyser under environmental threat.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

Now a museum, this building was once a 14th-century monastery and the place where the founder of the Dutch nation lived and was assassinated.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A century-old tradition has culminated in a small but singular collection of feline effigies.

A six-ton wedding present for the King of the Scots.