Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

A lush indoor jungle fills this bustling Madrid transportation hub.

A pair of gigantic baby heads greet passengers at Atocha Station.

A small museum displays some of the artifacts discovered during a subway station renovation.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

This educational institution and reference library specialize in the psychic arts and mediumship.

The bones of two medieval royal lions were discovered at the historic fortress.

A tribute to an explorer and naturalist often overlooked by history.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

Repository for more than 22 million pickled specimens.

The Tudor-style cottage in the middle of the square is not quite what it seems.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

A giant scrawl on the skyline of south London.

Legend has it this gnarled old tree was planted by Tsar Peter the Great during his visit to London.

These morbid carvings remind churchgoers of the inevitability of death.

A much-loved local landmark pays tribute to the shipbuilding past of this area.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A historic hill of tall tales, with one rather special tree.

The remains of a historic football stadium that once hosted 50,000 spectators.