This cramped crevasse saw the entire population of its island suffocated inside its depths.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

A unique waterfall that some believe attracts the fairfolk.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

This tangled English forest looks like something right out of a fairytale.

The curios of pharmacist and collector Henry Wellcome.

Anonymously sculpted and donated, these sculptures made from poetry books and pages are sprinkled around the city.

A 30-acre garden inspired by the principles of modern physics.

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

These fantastically named natural pools look like something out of a Scottish myth.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The resting place of a Civil War celebrity's amputated limb.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Visit the monolithic tomb of America's most famous general.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.