A moving and macabre World War I-era painting by the great artist Otto Dix.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

A small hippo-shaped fountain in Berlin, Germany.

One room inside this building mesmerizes all with its parabolic dome.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

A spitting ode to a German serial killer.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Where royalty waits in the height of luxury.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Europe's official "zero-level," the equator of elevation.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A measuring mishap led to these artificial stone ladies losing their stomachs.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

A subterranean display of public art and architecture.

On high feast days, the entire blue-glass front of this modern church opens up to reveal the small wooden church inside.

A stairway to heaven, or to nowhere at all.

One of the most easily accessible examples of the rare 1960s UFO houses.