The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This statue celebrating everyday life in Dublin has a few unsavory nicknames.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

The enchanting archway is the only surviving portal into Dublin’s lost medieval wall.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A giant bug impaled on a 75-foot-tall needle.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

A little sculpture with a large wardrobe.

Cycling around the Veluwe visitors are treated to a collection of stones from around the world.

This historic electric train has operated with regularity since the early 1900s.

The unexpectedly beloved remnants of a controversial thermal power plant.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

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.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A decaying, yet still functioning, work of communist architecture.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

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.

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

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