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

One of Amsterdam's narrowest houses is located right across the canal from its widest.

The former headquarters of history's oldest megacorporation.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

A beautifully eclectic mix of architectural styles.

Museum preserving torture methods from the past.

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

This unattributed sculpture in Amsterdam is hiding in plain sight.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A set of seven houses, each built in a style that represents a European country.

This plaque marks the former home of one of the first women physicians in the Netherlands.

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

The last of Amsterdam's original sea level markers remaining in place.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

A museum-like shop that has been producing clogs, brushes, and ropes for nearly 200 years.

The largest flower auction house in the world.

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.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

Twisted buildings adorn the banks of the Rhine river.

This futuristic German television spire is actually the world's largest digital clock.

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

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.