This much reformed Modernist building will be of interest to fans of contemporary architecture too.

One of several memorials to the dead of Spain's foreign legion on the Spanish mainland.

The load bearing parts of this historic 18th century canal aqueduct has largely been hidden from view by 20th century road construction.

This 11th-century fortress is now the seat of Aragon’s state legislature.

The engineer of the Imperial Canal of Aragon installed this fountain to show skeptics he had achieved his aim.

This grandiose staircase was part of the revival of a medieval Spanish architectural style combining Christian and Islamic influences.

The world's largest sundial can cast a shadow more than 1,600 feet long.

Europe's largest river aquarium features freshwater species from around the world.

This fantastical faceless sculpture in Spain is on the grandest scale.

The most amazing structure built for the 2008 Expo

A statue of a boy looks up at where the famous rival to the Leaning Tower of Pisa once stood.

The geomorphology of the Turia Valley could easily be mistaken for Utah or Arizona.

The interior of this small parish church is unremarkable until you look up.

Once a spa resort, then a tuberculosis sanatorium, and now a crumbling ruin.

A private collector gathered these sound machines and musical instruments across five continents.

This fascinating reservoir represented a dam in Afganistan in Guy Ritchie's movie, " The Covenant ".

A 140-year-old cemetery with some unique subterranean features

A slice through the original, iconic, rail bridge across the Menai Straights.

The man-made mound once voted the best landmark in the UK.

People who drive past Bedworth on the A444 bypass often wonder about the origins of this tower

A historic 18th century transportation interchange where arguments about tolls resulted in a very unusual lock.

Concrete strongholds stand guard over the Golden Gate.

A six-ton wedding present for the King of the Scots.

The stately remains of Llywelyn the Great's mighty fortress.