Doors

Doors are much more than simple barriers; they are complex architectural elements with a history spanning over 5,000 years, ranging from ancient stone gateways to high-tech NASA portals.

: Invented in the 1st century AD by Heron of Alexandria , this early steam-powered mechanism used heat from a temple fire to trigger a series of pulleys that opened the doors. Doors are much more than simple barriers; they

: The earliest "doors" were likely large rocks or animal hides. By 3,000 BCE, Egyptians were using single-piece wooden doors for tombs. Doors are much more than simple barriers; they