This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This Neolithic passage tomb forms part of a World Heritage Site.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

A stunning Victorian abbey and walled garden on a lakefront.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

The pockmarks across the building's facade are remnants of the Blitz.

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

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

A unique tribute to the millions of animals who served and died for the British military.

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Collection dedicated to brands, packaging and advertising.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Rebuilt remains of a temple to Roman god Mithras.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

A naturally mummified 2,000-year-old man.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Hidden in the courtyard of the Victoria and Albert Museum is a little-known tribute to two celebrity pooches.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The famous polar explorer stands outside the Royal Geographical Society's headquarters.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.