The odd cement nubs littering this Spanish square are actually the entrances to a series of buried silos.

A small house in Tazones, completely covered in shells.

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

The surviving remnants of a destroyed medieval church now stand in a public park.

A house covered entirely with shells.

A fiery-red region of scooped out land still largely untouched by civilization, tourists or otherwise.

This Bronze Age man spent millennia buried in a mine, giving his bones an eerie hue.

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

The Gaudí-inspired building that was the start of Terrassenc modernism.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

A beautiful but toxic fountain of mercury.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A sweet symbol marks the place where torturous executions were once carried out.

Two plaques commemorate the site of Shakespeare's first theatre.

Pop culture has helped to keep this iconic British building from being destroyed.

This stately estate house features a tower covered in a bright, modern mural.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

The atmospheric road was never meant to be so creepy.

This South London cemetery holds the remains of more than 15,000 people.

The childhood home of Earth's alien chameleon is a humble Brixton flat.