A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

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

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Just like in Hollywood, Madrid has also a forgotten walk of fame.

This funky former tobacco factory is one of the most striking examples of Madrid's cultural diversity.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

This suburban British town holds secrets that would have made the druids proud.

A movable feast that is an East London institution.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

One of the few surviving street funiculars in the world.

This 6th-century church honors St. Tudno, the patron saint of Llandudno.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

An unexpectedly extraterrestrial room in a former Victorian resort club.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

The longest and tallest aqueduct in Britain can actually be sailed across.

The remains of centuries of copper mining appear like an alien landscape.

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.