I would like to start a talk about the following:

The possibilities of Designing and Constructing a Monolithic Glass or Growth Crystal Dome. The ultimate goal is to have a relatively self-sustaining stable environment, capable of supporting a population of 500 to 2500 inhabitants, with a micro economy for basic support and trade internally and externally. so we are talking here of a rather large dome with a ground base diameter of from 500 to 1500 meters. This will most likely turn out to be a true half dome, with a possible portion under ground elevation.
The structure is to be composed of a solid glass type, and/or crystal growth material, and maybe concrete of some kind. Preferably any type of this fabricated material should have it's natural resources nearby. So e.g. in the case of glass this would be silica sand. Energy for the glass type dome manufacturing could come from solar radiation. For a crystal growth material,...no idea.
There are many questions that need to be answered. From material sciences to social and political ramifications to bio-diversity.
This should turn out to be interesting. The more minds come together on this the more it will become reality.