The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The largest of London's subterranean rivers and once a mad, bad center of London life.

One part local history, 99 parts gruesome haunted house.

An unusual round church in London with a Templar past.

360° views of the city plus five floors of optical illusions and hands-on science.

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

Famously misunderstood wonder of the ancient world

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

A misnamed well, with a deep dark past.

A pair of connected skyscrapers form this symbolic gateway.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This automated sculpture of two men peeing will spell out text messages with their micturition.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

An ancient knight and a symbol of the city's freedom.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.