Fortified medieval tower house with lovely roof garden.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The naturally mummified body of a peasant girl saint.

This peculiar Italian elevator runs both horizontally and vertically.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A small self-proclaimed micro-state located on a piece of disputed territory between Croatia and Serbia, near Liberland.

A self-proclaimed libertarian micro-state on a tiny bit of disputed territory between Serbia and Croatia.

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 statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

This building has survived for more than a century and remains virtually untouched.

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

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

One of Belgrade's most beloved animals.

A Serbian church lit by chandeliers made of weapons.

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.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

Stone age urban planning.