A semi-scholarly approach to sex.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

An architectural oddity hides in plain sight on this iconic London bridge.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

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

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

The cedar tree in Highgate Cemetery earned its title by accident.

A naturally mummified 2,000-year-old man.

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

Catacombs turned marketplace.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

One of downtown Berlin's last reminders of its Communist past.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The most visited, and possibly most controversial, museum in Germany.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

This former farm In northern Iceland is now a museum, where visitors can tour beautifully-preserved turf houses.

A restaurant devoted to "trouser grip" wrestling, an ancient form of Viking wrestling that is Iceland's national sport.

One woman's lifelong collection is on display in this unassuming house on an Icelandic fjord.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Iceland's tribute to its thankless civil servants.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.