This air raid shelter from the Spanish Civil War is now a museum dedicated to the history of the city's bombardment.

If you like Art Deco you will love this bridge.

This exhibition space designed to look like the skeleton of a whale is hidden underground.

Continental Europe's only museum devoted to salt and pepper shakers features more than 20,000 designs.

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

The magnificent sanctuary is Spain's first purpose-built structure of its kind.

The abandoned club hides in the hills of Ibiza.

Semi-mystical manmade towers of rocks decorate this rocky seaside.

A solitary lighthouse in Spain was an inspiration to the great Jules Verne.

This Ibiza botanical garden showcases some wild machines that run on plants, literally.

The largest cave on the island of Menorca was likely the site of Iron Age rites and rituals.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

This "flat geyser" bubbles up out of the ground periodically like a disappearing river.

This historical manor is complete with a magnificent garden.

This 17th-century manor house provides a fascinating glimpse into old-world Mallorcan life.

This spectacular bridge is part of an abandoned train line that once connected Mallorcan capital to the southeastern coast.

This historic electric train has operated with regularity since the early 1900s.

A contemporary art installation housed within a Gothic cathedral.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.