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

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

Almost too short to be an actual street, this stretch of road maintains a unique moniker.

A winding cave grotto walkway built to provide employment for veterans after World War I.

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft.

This large stone off the coast of Martinique had a brief career in the Royal Navy.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A surreal museum of extraordinary industrial objects.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This one-time health resort was used by aristocrats around the world.

This abandoned Slovenian military barracks has become a punky-political art squat.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

This water-powered cliffside railway is one of the steepest funiculars in the world.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A hugely vast Irish landscape of barren rock that stretches for miles.

This hidden green space is the city's second largest conservatory.

A living memorial to the trees London lost during the Great Storm of 1987.

London's old-school healing garden.

Nearly 2 billion seeds from 38,000 species are stored and processed at this visitable facility in a quiet corner of England.

An avant-garde artist is survived by his seaside garden.