Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A walkable map of the world, made from soil and stone by one man.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

France's national museum of scientific and industrial instruments.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.