The oldest known door in the world is in the ancient Egyptian city of Hattusa, which dates back to around 2000 BCE. Made of cedar wood, the door is intricately carved with depictions of gods… Read More

In the late 1800s, Theophilus van Kannel supposedly designed a revolving door because he hated chivalry. He didn't like to parry with other men over who should enter or exit a door first. Ev… Read More