The oldest stone house in Paris was built by its most famous alchemist.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

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

London's marvelous wildfowl reserve along the Thames.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

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

This lush area was the site of extensive enemy bombing during WWII.

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

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

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The sumptuous ceiling was one of the last things Charles I saw before his execution.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

A unique tribute to the millions of animals who served and died for the British military.

A plaque marks the underground site of one of London's "lost rivers."

Where Aleister Crowley attempted to seize the Hermetic Order of the Golden Dawn in a mask and a kilt.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.