This famous city eluded concrete detection until the early 2000's.

This one-time health resort was used by aristocrats around the world.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

The palace of the King of Kings, burned by Alexander the Great.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

360° views of the city plus five floors of optical illusions and hands-on science.

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

Hear the quietest sound from across the dome.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The celebrated eyesore created by starry-eyed sweethearts.

The atmospheric road was never meant to be so creepy.

Museum preserving torture methods from the past.

Tubing through a cave lit with glowworms is a magical underground experience.

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

Famously misunderstood wonder of the ancient world

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Northern Ireland's Brobdingnagian stepping stones.

Monasteries on rock pillars, once accessible only by frayed ropes.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Macabre astrological automaton clock dating to the late 1400s.

An ancient capital city that dates back 3,000 years old and harbors many surprises.