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

London's marvelous wildfowl reserve along the Thames.

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

This neighborhood grocery houses a treasure trove of Eastern European delights.

This enormous banquet-themed artwork honors over 1,000 notable women throughout history.

The bones of two medieval royal lions were discovered at the historic fortress.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

An architectural oddity hides in plain sight on this iconic London bridge.

A decommissioned military complex that's now a modern industrial park.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The medieval woodcut-style artwork chronicles life in medieval London.

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

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

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

The commemorative stone column conceals a secret laboratory.

Its collection includes a broad array of social, geographic, graphic design, and political history.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.