The remnants of a depressing public toilet are now a hub of ever evolving street art.

Be on the lookout for the symbolic insect all over the city.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

A fantastic example of Victorian railway engineering with two unusual decorative features.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

One of Ireland's most infamous prisons for rebels including men, women and children.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The prototype for all Nazi concentration camps.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Pilgrimage site for star-crossed lovers.

A church of bones, decorated with 40,000 human skeletons.

A battle between nature and architecture in the Cambodian jungle.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Medicinal spa created with the discharge from a geothermal energy plant.

A little sculpture with a large wardrobe.

Famously misunderstood wonder of the ancient world

The celebrated eyesore created by starry-eyed sweethearts.

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