Inside this Krakow church, an explosion of psychedelic color.

A monument to the bloody fight against fascism in Slovakia during World War II.

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

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

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

This massive underground salt mine now holds a sci-fi theme park in its depths.

Something's watching you.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This Transylvanian church has changed its denomination four times.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

A collection of items from a way of life that no longer exists.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

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

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

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

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

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Romania's triumphal arch looks out over Bucharest.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

An idyllic traditional timber village on a picturesque hill was built for a film.

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