The “Grand Canyon of Maine” is a three-mile gorge full of striking geological features.

This nature mural exists to protect the surrounding environment and its own canvas from destruction.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

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

Famously misunderstood wonder of the ancient world

One of only two commuter aerial tramways in the United States.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

A beautiful geyser under environmental threat.

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

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

World's first "penitentiary," meant to be humane, drove men insane.

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

The Cape Cod house that whaling built.

All that remains of the once-booming chain is a single orange-roofed restaurant.

A massive Montreal stadium that has seen nothing but trouble since its inception.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

The oldest continuously-operated inn in the United States, once owned by Henry Ford.