One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Step past the gas pumps and into a fine French bistro.

The wreckage of a World War II bomber is hidden high in the Colorado wilderness.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Practice your Dirty Dancing lifts in the manmade lake where Johnny Castle himself did.

Incredible miniature towns and buildings created and decorated with thousands of tiny rocks.

One person's lost luggage is another person's treasure.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

FDR hoped to find a cure for polio in this Georgia town's warm springs.