A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Soaring over the Niagara Whirlpool since 1916.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The longest continuous underwater road in North America was built at the insistence of Franklin Roosevelt.

Discover the taste of mold.

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

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

A miniature city built by a single hunchbacked monk.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Come for the speed, leave in love with the desert.

California's own majestic geyser is powered by a subterranean volcano.

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

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

A multimedia experience that chronicles the atrocities of racism.

Megachurch turned Catholic church comprised of 10,000 glass panes.

A house carved into a rock in the 1940s.

Most-visited and most-photographed slot canyon in the American Southwest.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Enormous lake at the bottom of a unique cave system.

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

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.