A monument celebrating the idea of reaching inaccessible places.

Officially named the "Loneliest Road in America," this barren stretch of Nevada road offers almost nothing but sky and open fields.

An artificial crater field that trained astronauts for lunar exploration.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

This downtown Dallas art installation is always on the lookout.

Don't blink or you'll miss it.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Largest magic museum in the United States with more than half a million pieces of memorabilia.

The remnants of an early American attempt at missile defense.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A museum designed by and dedicated to P.T. Barnum in the town where he is buried.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

The grave of Mary Nasson is shrouded by witchy legends.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Two men, two visionaries of Venice Beach, one little hotel that smells like cookies.

Narrowest house in Boston.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

This zombie-themed restaurant stands out in the heart of corn country.