A Romanesque tower appears when water levels drop.

The "mysteries" of this quintessential roadside oddity were almost destroyed by neglect but were saved by fans of kitschy wonder.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

This shallow cave got its name from copious amount of human bones found inside.

A massive sea stack famous for its appearance in The Goonies.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

At 238 feet above the bottom of a gorge this span is known as the biggest thrill on the road to McCarthy.

Permanent exhibit reminds visitors of the Exxon Valdez.

The king of U.S. high points towers over every other peak on the continent.

Four-story concrete hotel never opened to customers.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

The ghostly remains of what was once the world's richest copper mine.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.