River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Eclectic collection of rare and beautiful stones in a historic home.

This deceivingly ordinary warehouse hides an enormous collection of pop culture treasures.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

A spectacular slot canyon at the northern edge of Lake Mead National Recreation Area.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

World's second largest particle accelerator, where nature reveals its secrets.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Honoring the star of the “The Bob Newhart Show” which took place in the city of Chicago in the 1970s.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

First planned industrial community in the United States.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

A tiny slice shop hides down an unmarked hallway in a Las Vegas casino.

A 30-foot-tall goat tower in central Illinois is home to a herd of Swiss ungulates.

When Motown musicians came to Nashville in the 1960s they stayed at this historic record-pressing company because hotels wouldn't host them.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

A mine fire has been burning under the deserted town since 1962, but this church is still going strong.

The train collection of an eccentric New England seafood mogul is now a National Historical Site.

Community bookshelf of 25-foot-tall book spines.

The golden age of flight captured in a downtown airport.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.