The world's only museum devoted to the wonders of fluorescence.

A giant yellow phallus sculpture hidden in the gardens of the Museum Boijmans Van Beuningen.

The Netherlands' first car tunnel has an unusually rectangular shape.

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

A modern reimagining of a medieval city gate.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

A dramatic art installation features a BMW flying out of a building in Rotterdam.

A true Valhalla for cactus and succulent lovers.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Atop this former dutch railway office sits an interstellar work of art.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Carved fountains poignantly placed in parks and in front of special monuments.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

The first (but not only) upside-down house in Germany.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

Crop circles inspired this whimsical garden in Germany.

A stunning two-story timepiece within a medieval Brick Gothic church.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.