Claude Monet was baptized in this lavishly ornate Paris church.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

This museum houses an imposing skeleton army comprised of creatures great and small.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

A museum of magic with a Sadist past.

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This massive library holds what was once the largest book collection in the world.

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

This unattributed sculpture in Amsterdam is hiding in plain sight.

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

The attic of a four-century-old canal house hides a clandestine church.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.