Shark Aquarium in Paris underwater roomCourtesy of AirbnbSome of the world's biggest hotel brands are coming up with plans that are sure to stun even the most seasoned of travelers. 

First, they made villas that looked like they were floating on water off islands in Asia, but now they're taking these to new heights — or depths. In recent years, underwater hotel rooms have taken over the resort world. This next big thing in the industry allows guests a front-row view into the stunning scenes that take place under the sea. 

The idea is still up and coming, but a lucky few places have already put the plans into place.

Here are the world's coolest underwater hotels so far.