This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This abandoned Slovenian military barracks has become a punky-political art squat.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

This one-time health resort was used by aristocrats around the world.

A church of bones, decorated with 40,000 human skeletons.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Macabre astrological automaton clock dating to the late 1400s.

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

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A small burial plot formerly stranded in the middle of a road.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The palatial McDonald's that inspired Wesley Willis.

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

Five candy-colored villages on the Italian Riviera.

The bomb-ravaged remains of of a colossal Neptune.

Romania's triumphal arch looks out over Bucharest.

This Transylvanian church has changed its denomination four times.

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

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

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

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

France's most famous cemetery, with some of its most curious tombs.

The celebrated eyesore created by starry-eyed sweethearts.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...