The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

The Cathedral of Salamanca has a number of unusual carvings but none so surprising as a modern astronaut.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

A Romanesque tower appears when water levels drop.

Village situated on a narrow volcanic escarpment.

A Spanish town built into the cliffs.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Bacteria and algae give the salty water its bubblegum hue.

Wonderland replication in progress by one persistent man.

An ancient Egyptian temple in the middle of Madrid, Spain.

This giant sculpture made of trash is a critique of society's wastefulness.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

Dead weights honor the dead of Portugal's fishing industry.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

This small chapel is built of human bones and decorated with a golden skeleton.

Its collection highlights the monumental tasks undertaken to map Queensland.

The unique work of art celebrates the 30th anniversary of the 1988 World Expo.

A colorful sculpture of an Australian symbol patrols an otherwise ordinary traffic island.

The sculpture shows a water rat turning the world upside-down, landing an elephant on its head.

A nearly lost tribute to an 11-year-old boy killed during a World War I homecoming parade.

Its most grisly object is a jar full of severed fingers allegedly cut off by prisoners to avoid work.

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

One of the first big sculptures anywhere in Australia.