An automaton perched above an classic clock and watch store

Stuck in the middle of a modern Madrid city block are the remains of a 19th century sports complex.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

This small and often-overlooked museum holds some of Spain's finest artistic treasures.

You must take the A train... to the last active cemetery in Manhattan.

A notorious punk house turned co-op.

Mysterious 500-year-old tapestries depict a unicorn hunt.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

The earliest pagoda built in the beautiful Panmen Scenic Area of Suzhou.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

Small church on top of a huge rock column.

The astonishing collection of an infamous criminologist.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

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

A naturally beautiful, seemingly bottomless deep blue spring.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

The remains of a sunken military ship wreck visible through clear water.

Yugoslavia's biggest underground airport lies in ruins.

The elliptical citadel resisted the advance of the mighty Ottomans several times, thanks to the military prowess of the "Dragon of Albania."

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

One of the world's oldest olive trees, thought to be over 2,000 years old.

This tower is all that remains from a medieval fortress.

A Roman monument to their own civil engineering prowess.