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

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

A memorial for public executions that dates back to the 14th century.

A herd of half-sized cow sculptures has stood in this part for nearly 50 years.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

This massive metal scallop is a tribute to an English composer who once walked across this beach.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

A fake medieval village in the middle of Turin.

This Torino museum honors a soldier who kept the city safe using barrels of exploding gunpowder, losing his life in the process.

A Byzantine-era church hidden in a wooded area below the Acropolis.

This sculpture encompasses the emotion of rail travel.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

Scars of this building's past life as a violent prison still cover its walls.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A sharp sculpture made of thousands of pieces of jagged glass.

A giant baby floats in the middle of Singapore’s nature park.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Down a pint of ale where the Bishop of Ely's servants slept in 1546.

In 1999, a new equine figure was cut into this English hillside near the site where an older white horse had previously appeared.

One of the smaller hillside chalk horses was designed and cut in by a group of local students in 1804.

A strange and ancient landscape hides the dark, cavernous remains of a 5,000-year-old flint mine.