If there is a challenge out there in building, Dubai will be doing it. This is a ridiculously expensive luxury resort built on the ocean floor, 66 feet below the surface in the Persian Gulf. When fully completed, it will have a land station with a see-through train tunnel going into the water and below to the hotel. With 220 suites, it will be the first of it's kind, each suite with clear glass around the sleeping and bathing areas. This company plans to build them all over the world as well. According to their website look for them in Monaco and New York as well as places without water like Munich and London. I look forward to seeing an underwater resort without the water…wait, we have those. They are called hotels.
Poseidon Undersea Resort , Fiji