Mars Vegas is the martian Las Vegas with everything the real Las Vegas has: casinos, expensive hotels, night clubs and roller coasters. The old one was in the intro in Into the Wild Green Yonder, with the ship crashing into a sign next to a restaurant titled "Buggalo Bills", a parody of Buffalo Bills. A new one was built and which the Planet Express crew got free rooms and free dinner after Bender blackmails Leo Wong. The new Mars Vegas is bigger than the old one, with the same stuff but better. It's slogan is, "What you don't know about your bedspread won't hurt you".
New Mars Vegas[]
"Old" Mars Vegas was demolished by Leo Wong in Into the Wild Green Yonder, to make way for "New Mars Vegas". New Mars Vegas is bigger than the old one and has the same stuff but "better".