Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

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

Giant busts of 42 U.S. presidents are sitting in a field in Virginia.

Many of Edinburgh's more unsavory characters spent their final days behind this door while awaiting their executions.

A lonely beacon, precariously perched atop a remote sliver of rock.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

A hidden three-foot-wide house separates these two regal churches.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A giant Troll lurks under one of Seattle's oldest bridges.

Countless grotesque faces stare out from this eerie Prague art wall.

This amazing 15th-century mural remained hidden in plain sight for centuries.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

400-year-old garden, restored to beauty.

Ancient structures used to make and preserve ice in the deserts of Persia.

This wooden chair dates possibly back to the 15th century, and commemorates a local legend.

The statue honors a beloved bird that once roamed St. George's Market.

This Parisian café sticks almost exclusively to an ethos of reuse.

Apartment complexes built into huge repurposed natural gas tanks.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This statue dedicated to the story of a Flemish boy and his dog was relatively obscure in Belgium, but a cult sensation in Japan.

This hulking behemoth is actually five interconnected towers built in the 1960s.

The first ever diner included on the National Register of Historic Places is famous for its custard French toast.

The original place where water met land in the City by the Bay is outlined in brass.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.