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

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

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

The largest whale museum in Europe allows visitors to walk among life-size giants.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

An encyclopedic collection of mammal penises.

A little sculpture with a large wardrobe.

Brussels' favorite peeing boy has a sister.

When you're a great Russian Tsar, even your vomit gets a statue.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

This modern arts center is built around a gem of late-Baroque architecture.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

One of the last realized projects of an influential, self-taught, French Modernist architect Jacques Couëlle.

A sanctuary for wolves in a community which once trembled in fear of the murderous "Beast of Gévaudan."

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

This bridge was constructed from the rubble of the infamous Bastille.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

The deserted pirate-themed restaurant still entices explorers.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.