A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

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

This unusual elevator doesn’t stop or slow down.

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

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

Cat art as far as the eye can see.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

One of the oldest masonic museums in Paris.

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

The narrowest street in Paris.

The curious underground history of keeping Paris clean.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.