One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Mountain where Jesus was first tempted by the Devil.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This metro station doubles as an unintentional paleontology museum.

Visit an imposing 13th-century Transylvanian fortress lurking not far from the region's more heavily touristed attractions.

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

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

Romania's triumphal arch looks out over Bucharest.

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

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

Something's watching you.

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

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

A muddy alien landscape that is home to rare species of exotic plants.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

This once-derelict building is now one of the most beautiful bookstores in the world.