Via boing boing, tents or not.

Three churches among others(?), same architect, Charles Geddes. There was a good article in a recent newspaper, but can’t find it.

• Noe Valley Ministry, San Francisco, 1888
• Westminster Presbyterian Church (St. Procopius Church), Berkeley, 1879
• Community United Methodist Church, Half Moon Bay, 1872

See Witold Riedel for two articles on earth structures, one of which is a drawing with eight variations and the other article gives links to Nader Khalili.