Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

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

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

A modern English garden of eccentric beasts, follies, and oddities.

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

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

A cluttered and astounding collection of antiquities and curiosities.

A 200-year-old prison that now houses a peculiar crime museum.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Hear the quietest sound from across the dome.

The longest hedge maze in the world.

An unusual round church in London with a Templar past.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

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 curios of pharmacist and collector Henry Wellcome.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A fantastic castle rumored to be the birthplace of King Arthur.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.