A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

Amsterdam's Red Light District leaves little to the imagination.

The facade of this bank has changed little over the centuries, including its unique welcome sign.

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

This museum inside Amsterdam's largest cemetery explores how people deal with death.

A beautifully eclectic mix of architectural styles.

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

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

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

A beautiful maze marks where three countries meet.

A curious collection dedicated to human and animal anatomy and pathology.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

This Funeral Hearse Museum represents the finest in cadaver transportation.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

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

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

A surrealist timepiece by the artist of melting clocks.

A museum of carnival attractions where you are invited to ride the rides.

An enormous Soviet aircraft, the only one of its kind, stands at the deserted shore of the Caspian Sea.

This monument commemorates the soldiers who fought for 16 hours straight to penetrate this concrete fort.

A former military outpost of Ivan the Terrible, the 16th-century church contains some of the rarest examples of Eastern Orthodox mural paintings.