Everybody want to be the highest

Who has the highest astronomical observatory in the world?
Qinghai-Tibet Plain, Popular science astronomical observatory, 3600 meters above sea. (Link)

Big Island of Hawaii, Masurium Naji Asia mountain astronomical observatory, 4200 meters. (Link)

Colorado Rockies, Mt.Evans Meyer-Womble Observatory, 4303 meters. (Link)

Western edge of Himalaya mountain, India astronomical observatory, 4500 meters. (Link)