The home of the first American-born saint is one of the only curved buildings in New York.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

These marks in Myddelton Passage aren't your run-of-the-mill vandalism, and they weren't made by your typical vandal.

One of the world’s leading and most extensive archives on the Holocaust, the Nazi era, and genocide, this collection includes published and unpublished works, press cuttings, photographs, and eyewitness testimony.

A display of everyday life in the area that was unveiled during the 2012 Summer Olympics.

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

The ritual has been performed uninterrupted for nearly 700 years.

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.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

A lasting remnant of the London Blitz.

This overlooked street light once served as a KGB dead letter box.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

This stone spire holds a unique place in the region's history.

Heralded as the oldest statue in London.

This device was crucial to the Industrial Revolution development of Leeds.

This restaurant's specialty is "a major enigma for food historians."

Outside of one of Britain's most renowned social clubs, a step installed specifically for the Duke.

A stone-filled garden in the heart of Edinburgh commemorates the father of modern geology.

The Ranger’s House exhibits fine mementos collected by Sir Julius Werner during the course of his life, including this infamous pendant.

This pub boasts a curious history and may have inspired a Dickens character.