This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A series of idealized caves carved to entertain guests.

Legends say this red sandstone monolith and the dozens of smaller boulders that surround it were once a coven of witches—before a Scottish wizard turned them all to stone.

Though this large circular site is now named for the legendary king, its history dates back to the Neolithic era.

An impressive Neolithic henge with banks nearly 10 feet high.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

The colorful stairs are made with marble from the world's major quarries.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

This early version of the guillotine was used to execute the man responsible for its construction.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

This small museum in a 17th-century building honors three iconic Scottish writers.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Follow the original medieval paths that wind through this intriguing section of the city.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

The monster at the center of the Darwin Center Spirit Collection.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

A cluttered and astounding collection of antiquities and curiosities.

The curios of pharmacist and collector Henry Wellcome.