Doorshd

: Metalworking advances around 1200 B.C. allowed for stronger frames made of iron or brass, leading to more intricate and secure designs.

: Early humans used simple stone slabs, animal skins, or wooden barriers to block cave entrances and primitive dwellings. DoorsHD

Norman Doors: Don't Know Whether to Push or Pull? Blame Design. : Metalworking advances around 1200 B