What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

Ship skeletons haunt Baltimore's waterways.

The remains of diamond fever taken over by the desert.

Where experiments are conducted on all things wood.

The former residence of Elizabeth “Mumbet” Freeman, an enslaved African-American woman who successfully sued for her freedom.

A complicated contraption for telling time by the moon.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A century-old shot ball factory tower is open to the public once a year.

This unassuming stone commemorates a condiment factory gone up in smoke.