The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

The largest flower auction house in the world.

Colorful and chaotic stacked hotel in North Holland.

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

This cheese shop also houses a museum devoted to Dutch dairy.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

This museum is housed in an unassuming building that witnessed one of the most daring feats of satire in modern history.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This banal Parisian entranceway is not what it seems.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The oldest stone house in Paris was built by its most famous alchemist.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

What looks like a normal building is really a hollow facade hiding a subway vent.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Paris' linguistic guide to the international language of, yes, love.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.