While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This subterranean funicular is one of the world's smallest subways.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

America's most famous piece of self-built architecture.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

This stately estate house features a tower covered in a bright, modern mural.

This Scottish bridge seems to compel dogs to leap to their death.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

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.

Five million people are laid to rest here, more than the population of Madrid itself.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.