According to some, the giant doors found in old architecture were not built for ordinary-sized people, but rather for giant people who once roamed the earth. These theorists believe that mainstream history has been rewritten to obscure the existence of these giant beings, and that the giant doors were designed to accommodate their larger size.
The idea of giant people in ancient times is not new and has been suggested by various myths and legends throughout history. However, some conspiracy theorists believe that there is more to these stories than just myth and that giant people were once a real and significant part of human history.
Check out this short video About Giant Doors.