One of the oldest living oak trees in the Southeast.

The highest bridge in America was built for an almost unnervingly small amount of money.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Outsider art meets paleontology at this roadside reptile repository.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

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

A bizarre roadside attraction and the first instance of miniature golf in the world.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A mysterious castle built as a monument to lost love.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Where manatees are the snowbird vacationers in these balmy Florida springs.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

A self-built castle made by a mysterious man.