A mysterious artist-run cabinet of curiosities and library.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

This massive library holds what was once the largest book collection in the world.

The world's largest collection of witchcraft regalia.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A church of bones, decorated with 40,000 human skeletons.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

New York's oldest magic store.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Hot springs monkey spa in the middle of Hell's Valley.