The world is really full of strange places, so why not the strange hotels? You will not likely find any of these in the most recommended section of even the best hotel portals as they are not for sure for the average traveller.Jules Undersea Lodge, Key Largo, Fla.You can almost imagine this place like the isolated research labs in the DOOM movie and it actually is a former research lab located underwater. Those who cannot scuba dive can forget about staying here although you only need to dive 21 feet to reach their main lobby. This hotel can house a whooping 6 guests but, listen to this, each room is air-conditioned and contains a full 42-inch window in the water. Better draw the shades if you don’t want fishes and other deep-sea creatures peeping in on you! Hydropalace, Qingdao, China.