A local artist created this giant rippling wave.

These striking ruins of a castle resemble a ship's stern.

Of course Salvador Dalí lived in a castle...

Famed architect Antoni Gaudi built this generous thank you gift to a friendly host who housed him during a job.

A Romanesque tower appears when water levels drop.

Wonderland replication in progress by one persistent man.

Village situated on a narrow volcanic escarpment.

Religious dwelling in a Spanish volcano.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Stunning Roman aqueduct used for 1900 years and still standing.

Hundreds of stones dangle from barren trees in the middle of the desert.

More than 100 Hindu temples are slowly being swallowed by the forest.

Only 68 people per day are allowed to visit this New Zealand bird-watcher’s paradise.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

A statue honors the children who fought Nazis in Poland.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A 20th-century picture show in 3-D.

Real bones which are said to have belonged to a Polish dragon.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A beautiful but toxic fountain of mercury.

Home of the "true" equator.

A turquoise lake within a volcanic crater.

A swing to dangle you off the very edge.