The city of Trypticon is the home of the Decepticon army on Cybertron. It's remained surprisingly intact during the war over the Allspark. Among other things, it contains the home of the Decepticon leader, a large building that was adorned with a giant head of Megatron before some jerk blew it up. It was later entirely destroyed after Dreadwing attempted to overthrow Starscream.