If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

This popular cave pool is truly magical, despite the crowds.

Take a dip beneath the stalactites in this amazing cenote.

Few of the many visitors to this resort town know of its hidden Maya ruins.

A rare particle accelerator with a tremendous energy range is tucked away at Ohio University.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

In northern Ohio, the glorious past of America's trains is on full display.

The former broadcast site has been reimagined as a museum about the medium.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

This NASA test station is home to some of the world’s largest and most powerful space environment simulation facilities.

This recycled wax museum may be the only one that features John Travolta in a Bible scene.

This massive airship factory is so large that it has its own indoor weather.

A circle of giant painted vases in the former pottery capital of the United States.

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

Marvel at this turn-of-the-century masterpiece that has been turned into a rather stately supermarket.

A wonderful and easily overlooked museum tucked in Ohio's Burke Lakefront Airport.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

The permanent home of Elektro, the celebrity automaton of the 1939 World's Fair.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

A retro walk through the history of the tube.

A real flying saucer, contracted by the U.S. Air Force.

Deep scars on the earth left by the Ice Age.

Faces carved into the cliffs create an otherworldly walking trail.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.