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

The history and future of cannabis.

A public urinal so pretty, it was declared a national monument.

A stunning Catholic cathedral built by a curve-loving communist in Brazil’s newly created capital.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Strange, gentle beasts resembling goat-cow hybrids roam within this patch of forest.

The largest and, arguably, most scenic fortress in Bhutan.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

A Spanish forest is filled with mysterious stone carvings.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

Bacteria and algae give the salty water its bubblegum hue.

This 47-story "M" needed 20 years to be completed

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

Geological storytelling.

This awesome Spanish castle is so fantastical it was actually used on Game of Thrones.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

Vibrant street art created with mixed media.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

A micro-communist utopia in Spain with no police, no mortgages and full employment.

Spain's stunning solar energy plant.

An eerie collection of the surviving structures from a past celebration of the future.