This steel frame is a skeletal mirage of a lost 16th-century stone building.

A farm turned upside down.

This miniature take on the Kremlin is one Dutch man's retirement project.

Mosaics created from 11 million cigar bands.

The portrait of a man from Japan who sent weekly letters to a Dutch hotel he never visited.

Single runway interrupted by a busy road that cuts across its middle.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

This abandoned gold mine found a second life as a post-apocalyptic film set.

This small Spanish village still pays homage to the Spaghetti Western films that were shot there in the 1960s.

Haunted tuberculosis hospital built by the patients.

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

The two massive guns that defended Cartagena Bay.

Peek into a cave of giant, glimmering crystals.

The world's first electric battery-powered submarine.

Originally planted by the ancient Carthaginians, this sprawling palm grove is one of the largest in the world.

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

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

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

A dictator's failed public works project has been reborn as two linked trails through spectacular scenery.

If you like Art Deco you will love this bridge.

Vibrant street art created with mixed media.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.