An architect's childhood fantasy treehouse made real.

There’s a hidden military meme engraved on the World War II Memorial.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Inside a former cabaret, seven floors of erotic art.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

This plaque in one of London's oldest public hospitals commemorates the first meeting of two of Britain's most famous literary heroes: Sherlock Holmes and Dr. Watson.

This inn of the court provides a fascinating window into London’s legal and architectural history.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

These Victorian era devil sculptures were designed to spite a local vicar.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

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

A mysterious shape catches the eye in this 16th-century painting.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

This mysterious and unique painting is filled with symbolism.

Historic church where a number of Shakespeare's actors are buried.

It's a mystery why these remains were found with no traces of their bodies in sight.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

The plunge pool is a surviving relic of a rowdy royal residence.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.