Treehouse motel and treehouse-building school.

A showcase of engineering might that was also symbolic of westward expansion.

This beloved roadside attraction welcomes visitors with his signature neon smile.

Curiously, this large sporting goods store features 14 wax representations of American presidents.

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This ancient Irish landscape boasts hundreds of legendary ruins.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

All that remains of this abandoned coal town is a beautiful, haunting cemetery.

This highest peak in New Mexico is named after an explorer who had a habit of lending his moniker to peaks.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

This monument remembers the first Japanese Americans forcibly relocated during World War II.

A beachside monolith shaped by years of waves crashing against hard quartz.

Also known as the Cathedral of the Plains, this church holds the distinction of being one of the "8 Wonders of Kansas."

Site of the 1879 Cheyenne Outbreak and the site where famed Sioux chief Crazy Horse met his fate.

This divisive system of turtle tunnels was built to save animals stranded after a highway split a lake in half.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

The oldest house in Lindsborg, Kansas, includes some fascinating inscriptions.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

Enormous sandstone towers loom within a Czech forest.

Rare recess caves fill this unbelievably beautiful Ohio park.

When the river dries up, these stones start talking.