This nine-story building can be played like an instrument.

This vast kitty-themed collection illustrates the history of human-cat interaction.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

This North Carolina store preserves a historic moment in America's movement for racial equality.

A six-foot pair of socks hangs from a drawer of the world's largest bureau.

Christ's blood preserved in a Belgian town.

This "life-size" depiction of Mickey Mouse as a half-lobster is both whimsical and a bit creepy, standing guard over the Boston waterfront.

Dim sum, served in a grand old theater.

An enormous, inside-out glass globe built in 1935.

A beer pipeline runs beneath Bruges.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

An old slaughterhouse now holds the largest collection of pig artifacts.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.