5.Atlantica Fictional place under water whose ruler is king Triton. This place is sort of palace-city. It has walls around it, but it doesn't have classical roof, and inner walls and that's what makes it odd and doesn't feel like home.
Other than the fact we couldn't breathe in such place the turn offs were also the look of an abandoned place, kinda ruined, cold, with only few rooms, furniture and details. It surrounding is also quite depressing. Nearby is ship graveyard and nothing else. No other houses, public places for mermen and mermaids, just rocks and seaweeds.