A 63-foot-tall swinging ball hypnotizes passersby, and proves to any remaining doubters that the Earth is spinning.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.