Vacationing at the beach and playing in the water has become mainstream. What if instead of playing in the water, we go underwater? Here are some of the best underwater hotels in the world that are super cool for your unforgettable vacation.

Anantara Kihavah Maldives Villas is a romantic luxury 5 star resort with amazing facilities. Located on the island of Kihavah Huravalhi, Anantara Kihavah Maldives Villas is a group of thatched-roof villas, surrounded by blue waters and shaded by palm trees.

The Anantara Kihavah restaurant, is home to the world's only underwater wine cellar. Between one and two meters underwater depending on the tide, there is a circular dining area encased in thick glass overlooking the thriving marine life outside, and its octagonal ceiling displays marine activity overhead. Watch sea turtles and fish glide languidly as you dip in freshly plated Maldivian lobster or grilled Miyazaki Wagyu beef.

Atlantis The Palm in Dubai is a luxurious 5-star beachfront hotel with various facilities such as a spa, shopping center and Aquaventure waterpark playground. Although not the real “Atlantis”, Atlantis The Palm will bring you as close as possible to life on the fictional island “Atlantis”.

Perched on Dubai's palm-shaped Palm Jumeirah, Atlantis The Palm has stunning views of the Persian Gulf. But the magic that this hotel has to offer happens beneath the surface of the water. Take a private elevator and you'll reach two underwater suites, nicknamed Poseidon and Neptune.

In the bedrooms and en suite bathrooms, floor-to-ceiling windows offer views of the underwater waters, home to more than 65,000 marine animals. Get ready to watch stingrays and sharks pass by as you soak in the tub or lie in your bed.

Conrad Maldives Rangali Island is an exclusive luxury resort located in the Maldives. The resort is located on two separate islands, Rangali Island and Dhigali Island, and offers guests a unique and luxurious experience.

Ithaa's underwater restaurant is one of the most unique dining experiences in the world. The restaurant is located 16 feet below the surface of the Indian Ocean, offering stunning panoramic views of swimming marine life.

Ithaa means "pearl" in Dhivehi, the local language of the Maldives, and the name was chosen for this restaurant because of its shape like a manta ray. If you are looking for a truly unique dining experience, the underwater restaurant Ithaa at Conrad Maldives is definitely worth a try!

Niyama Private Islands Maldives is an exclusive luxury resort located in the Maldives. The resort is located on two private islands, Niyama and Landaa Giraavaru, and offers a wide range of accommodation options, from over-the-water villas to beachfront suites.

The resort also has a nightclub. Subsix, is the world's first underwater club of its kind. 500 meters off the coast and six meters below sea level, you have to take a seaplane to get there. Decorated with icy ceilings, fluorescent blues and ever-changing neon lights, the nightclubs and restaurants are visually stunning. Perch at the bar and order a Coral Sour, before dancing the night away and forgetting the world above the sea.

Radisson Collection Hotel, Berlin is a luxury hotel located in the heart of the city. While not an underwater hotel, the Radisson Collection Hotel in Berlin has the world's largest cylindrical aquarium, containing one million liters of saltwater and more than 1,500 tropical fish.

This aquarium is an impressive sight. Being under the vortex of overhead aquarium activity will make you feel as if you are diving.