This snug medieval lane is one of the narrowest streets in the world.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A giant portrait of an ancient king looms over the river.

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

Arguably Belgrade's only example of pure Art Deco architecture.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.

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

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

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

A statue of Paulina Hermann, the eccentric noblewoman known as the "mother of cats."

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

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

The metal leaves on this tree are engraved with the names of Holocaust victims.

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

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

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

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

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

A highly-criticized monument in Budapest has become the site of a makeshift Holocaust memorial.