Abandoned & Little Known Airfields
I'm not sure how up-to-date this site is. It does list Denver's old Stapleton Airport, but it doesn't list AUS's old Robert Miller Municipal Airport which closed on May 23, 1999.
Austin's old airport has not yet been absorbed into the surrounding community. I think a few of the hangers have been converted to sound stages that are used by the Texas Film Commission, but that's about it. The old terminal is still there and about half of the gates at the end of the main concourse still have their jetways attached.
I have 3 or 4 aerial shots I took in December, but I have to wait until I next visit my parents in Dallas so I can scan them.