There are a number of domes I tried to enter, but they are already in the database. I don't know if this site allows cross-listing, but they include Bucky Fuller's dome in Montreal (see Landmarks), the tensegrity Georgia Dome and the wooden Tacoma Dome (both under Buildings, Stadiums), and the Biosphere 2 (under Research Facilities). I did manage to sneak in the Epcot dome here.