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: The earliest "doors" were likely large rocks or animal hides. By 3,000 BCE, Egyptians were using single-piece wooden doors for tombs.

: 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. : The earliest "doors" were likely large rocks

: Many Irish doors are brightly colored as a historic act of rebellion; after being ordered to paint their doors black in mourning for Queen Victoria, many residents painted theirs in vibrant shades instead. Common Materials & Modern Trends Best Entry Door Buying Guide - Consumer Reports : Many Irish doors are brightly colored as

: The village of Shani Shingnapur in India is famous for having no doors or locks on its houses, as residents believe their faith protects them from theft. Historical Evolution : The earliest "doors" were likely large rocks