The obelisk honors the cyclist troops who were killed during World War I.

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

All that remains of the only English cathedral destroyed in the Protestant Reformation.

These medieval carvings bear scars left by Parliamentarian troops during the English Civil War.

Some wattle-and-daub, a Moorish mural, a glacial erratic, and a Giant named Gilbert.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A preserved dragon's rib that remembers the legend of the founding of the city of Atessa.

The oldest house in Glasgow is now a museum dedicated to the city's medieval history.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The monster at the center of the Darwin Center Spirit Collection.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A 50-foot-tall statue of Jesus where a stairway transports the faithful into his body.

Rebuilt remains of a temple to Roman god Mithras.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

This South London cemetery holds the remains of more than 15,000 people.

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

An ancient city exhumed from the depths of the ocean.