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

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A secret garden in a picturesque Edinburgh village has inspired artists for centuries.

London's old-school healing garden.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

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

Catacombs turned marketplace.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

The longest hedge maze in the world.

Rebuilt remains of a temple to Roman god Mithras.

The curios of pharmacist and collector Henry Wellcome.

Eighty million natural history specimens call this gargantuan museum home.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

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

One part local history, 99 parts gruesome haunted house.

Northern Ireland's Brobdingnagian stepping stones.

An unusual round church in London with a Templar past.

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

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

The atmospheric road was never meant to be so creepy.

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