This house's itty bitty size means no humans allowed.

Vibrant street art created with mixed media.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Long tunnels run under the ancient chariot racing circuit to the tower.

Stunning Roman aqueduct used for 1900 years and still standing.

This enormous censer uses a pulley system installed over 400 years ago.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

The most elaborate of 12 medieval arched doorways to the old city of Burgos.

Giant topiary dog once played a role in a terrorist bomb plot.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

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.

Mountain where Jesus was first tempted by the Devil.

Week-long block party becomes a competition for the best decorated street.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Two large posteriors in one giant statue.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.