A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

The final resting place of the "father of special effects."

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

The tomb of history's greatest potato promoter is surrounded by tubers.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The narrowest street in Paris.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

How did a French journalist’s grave become the sexiest statue in the cemetery?

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The history of this Moorish castle includes royals, a Mexican-Spanish association, and several attempts at lodging.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.