One other. Swift Productions has turned it into a nature preserve with recreated and fanciful animals. They broadcast footage from that, and have been intending to sell trips down to interact with the animals directly.

It's very far away from here, though. I believe in the former Amazon basin, but they've been secretive about the exact location to prevent sabotage.

If we could get oxygen and plant life into one of the ancient domed cities, people could live for a short time there, but I doubt it would work long-term without terraforming. The domes themselves were made for long-term, so they're probably still intact.