This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

This unusually-named reservoir found a second life as a nature preserve.

A secluded green oasis amidst the towering skyscrapers, bears an unusual moniker that reflects one of the city's oldest guilds.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

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and most extensive archives on the Holocaust, the Nazi era, and genocide, this collection includes published and unpublished works, press cuttings, photographs, and eyewitness testimony.

Preserved behind glass, the ruins of a medieval building used to store human remains.

What might be the oldest living tree in London has survived fires, bombings, and estate agents.

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

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

3,000 family pets and military animals are buried in this London graveyard.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

A mineral spring that became all the rage in 17th-century England.

A living memorial to the trees London lost during the Great Storm of 1987.

This peaceful park with centuries of history hides in an overlooked section of South London.

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

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

London's amazing modernist public square that never was.

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

London's marvelous wildfowl reserve along the Thames.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

What started as a way to address damp basement walls turned into a house filled with intricate hand-carved designs.

The commemorative stone column conceals a secret laboratory.

These ornate arches show how the course of the River Thames has changed.