Initial list taken from the Save the Universe RPG.

• A arcology built on the back of a vast whale-like beast that swims through the vacuum
• A continent-sized scrapyard which contains anything you might wish to find
• An upmarket, swanky, in-demand night club, with multiple floors, false ceilings, lift shafts, secret booths, and more unusual facilities like zero-G dance floors
• A great university and center of galactic learning
• A zero-G three-dimensional sports field trader town on a frontier world
• An exotic alien bar full of smugglers and bounty hunters
• A galactic warlord’s fortress
• An ancient space vessel from before recorded history
• A deserted and seemingly haunted space station
• A paradise pleasure planet
• A ruined city, destroyed by war
• A busy federal starbase
• A primitive planet where the natives think technology is magic
• A mining colony run by a corrupt corporation
• A penal colony overrun by alien creatures
• A futuristic metropolis of neon
• A grey, forbidden military base
• Dark caverns which hold secrets of the past
• An intergalactic circus or zoo
• A dinosaur planet
• An exquisite ballroom full of intergalactic dignitaries
• A colony in a hollowed out asteroid
• An exotic market on a distant planet where anything can be had for the right price
• An intergalactic graveyard
• A cliff upon which is written the oldest writing in the universe
• A time-travel facility dedicated to glimpsing the final hours of the universe
• A dark nebula containing a mysterious planet whose existence is a secret
• The underwater seas of an ice planet
• A planetary system deconstructed to create a Dyson Sphere
• A planet of intelligent apes
• A monitoring station hovering within the upper atmosphere of a gas giant
• An apparently abandoned starcraft of immense size hurtling towards an unknown destination and unwavering from its path
• A city at the core of a planet, protected from the magma by a failing forcefield
• A megalithic, automated factory blindly turning out vast quantities of items for a race long dead
• A floating graveyard of broken starships, the remnants of an ancient battle
• A fleet of city-sized fishing trawlers dredge-netting the oceans of an alien waterworld
• An arena ship that flies from planet-toplanet, offering huge prizes to those brave enough to participate in the games
• A haunted area of space that brings back the ghosts of the dead, and drives pilots mad