This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

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

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

Mile-long cave system near Great Smoky Mountains.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

A museum dedicated to the legacy of Bob Moog and his pioneering synthesizers.

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

A wedding chapel, vintage clothing shop, and bar all under one roof.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

A mountaintop space observatory that is certified dark.

A delightful park featuring homemade scale replicas of dinosaurs, tucked away in the Tennessee mountains.

An enormous warehouse filled with parade floats collected from over 50 years of patriotic celebrations.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

Extraordinary objects lurk in this quintessential regional museum.

A 17th-century bezoar, dirt from an infamous site, and other curios decorate this unusual bar.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

An alternate history park where the Union Army loses the war... to dinosaurs.

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

A large collection of motorbikes with some impressive gems.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

The oldest bar in Missouri is hidden within a limestone brewery cellar more than 50 feet underground.

Giant papier mache hog sits on private property.

One of the most acclaimed eateries in Arkansas is a two-table diner on the ground floor of a family home.