have tours. The Philip Johnson Glass House is open for tours right now BUT they are sold out, as of this writing, through July. It's located in New Canaan, CT and the website is here.
For a gl-assload of information about the architect and the house, download this PDF (you'll need Acrobat Reader, which is a free download from Adobe) and actually read it. It may be a bit sanguine but it is chock full of relevant info.
There is a 90-minute tour where photography is NOT allowed - this costs $25 and is conducted in groups of ten. The End-of-Day tour is 2 hours, is $40 per person and does allow photography. Tickets should be purchased in advance, obviously, and there is a discount for National Trust for Historic Preservation members of a whopping fifty percent. Cool. Your can join the Trust for as little as twenty bucks for an individual membership AND receive a handsome canvas totebag. So, join and the first visit to the Johnson House is basically five buck, or fifteen if you want to take snapshots. Sounds good to me.