Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

The carved medieval stones stand near the ruined abbey's parking lot.

An urban megalith steeped in local lore.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.

This mysterious Bronze Age standing stone has become a place where couples profess their love.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

Hidden in Carnfunnock Country Park is a lasting testament to the Normans who once settled in the region.

A rare example of an ancient Japanese hill castle believed to be the fortress of a legendary demon.

The inventor of the Coney Island hot dog rests in a grand mausoleum in Brooklyn.

The ruins of this Roman temple dominate the small city in southern Lazio.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

An ancient tree that was once the favorite of a young Swedish royal.

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

A giant Troll lurks under one of Seattle's oldest bridges.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

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

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This ancient fort overlooks the site of a disastrous retreat from the English Civil War.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.