As a personal project and memento, I spent the last couple of months grabbing demos of (almost) every zone in the game, along with lots of screenshots. If someone can tell me where to put 'em, I'll be glad to upload the demo files for the public.
Atlas, Galaxy (Echo), Kings, Perez, Hollows, Skyway, Faultline, Steel, Boomtown, Indy Port, Terra Volta, Talos, Striga, Croatoa, Brickstown, Crey's, Founder's, Eden, Peregrine
Midnighter Club, Cimerora, Pocket D, Rikti War Zone, Dark Astoria (live and echo)
Ouroborous
Outbreak(!)
Firebase Zulu, Cascades, Chantry, Storm Palace
Mercy, Port Oakes, Cap, Sharkhead, Nerva, St. Martial, Grandville
Bloody Bay, Recluse's, Siren's, Warburg
Nova Praetoria, Imperial City, Neutropolis, Underground Imperial(*), First Ward, Night Ward
(* chosen to be representative, not comprehensive)
You can either take my on-rails tour, or push F2 and explore as a free-roaming camera.