The three rules of real estate are: location, location, location. And normally house hunters prefer that location to be somewhere on dry land. But as this gallery of underwater structures will show you, some of the coolest and most lavish locales can be found below sea level. Some are still in the works, some are ancient, and many defy logic—but all of them are must-see underwater spectacles.

1. Ithaa: the Underwater Dining Room

At the Conrad Maldives Rangali Island resort, every diner gets a table at the window . . . or under the window. It is the world’s first entirely underwater glass restaurant, and—with a 180-degree view of the Indian Ocean—it’s the only place where you can watch the day’s special swim freely overhead.

2. Seuthopolis, Bulgaria: the Underwater City

As it stands, the city of Seuthopolis is literally underwater. The ruins of the culture that once thrived there were discovered in the midst of a reservoir construction project, and the water won the first battle. But a Bulgarian architect named Zheko Tilev is working to uncover the ruins and preserve it with a dam wall surrounding the city, protecting the burgeoning tourist location from the waters that would loom 20 meters above the city’s ground level.

3. Delaware: the Underwater Subway Reef

In practice, the project was simple enough. By constructing a manmade reef along the coast of Delaware, activists would provide a shelter for marine life and a place to scrap hundreds of out-of-service subway cars. But the idea itself was temporarily scrapped amid controversial reception to the idea and difficulties in maintaining the structure. Still, it makes for a fascinating picture.

4. Mexican Caribbean: The World’s Largest Underwater Museum

A marriage of nature and art if ever there was one. This collection of underwater exhibits and sculptures became open to the seafaring public in late 2009 in a truly unique and creative effort to raise environmental awareness.

5. Poseidon Resorts, Fiji: the World’s First Sea-Floor Resort

Maybe there’s something relaxing about the ocean. Maybe you’ve always wanted to feel what it would be like to be the one in the tank and have the fish watch you. Or maybe you just can’t pass up a chance to join the 40-feet-under-the-sea club. Whatever the allure, staying in one of these luxury underwater suites (in a project that’s a bit behind schedule) is as cool as it gets.

6. Alexandria, Egypt: The Underwater Museum of a Lost City

Queen Cleopatra’s palace, or what remains of it, is submerged in the waters of the Mediterranean, but the plans for an underwater museum are underway to bring it back to life in the eyes of its visitors. Unlike the Mexican underwater museum, which celebrates the environmental side, the museum at Alexandria would preserve the cultural treasures hidden in the waters.

7. Red Sea Star, Israel: the Underwater Bar

Moses may have parted the Red Sea, but visitors to the Red Sea Star don’t have to pass through on “dry” ground—they’ll have cocktails. The night observatory is gorgeous and unique, and the underwater scenery is like no other bar in the world.

8. Hydropolis, Dubai: the Fully Submerged Underwater Hotel

Like its counterpart in Fiji, the Hydropolis construction plan is running behind while the architectural ambition runs rampant. This deep-sea destination is slated to plunge more than 60 meters below the surface of the water. The images should be breathtaking, but, as with other speculative projects in Dubai, we’ll believe this when we see it.

9. Yonaguni, Japan: The Underwater Monument

This rock formation is something of a monumental mystery. Despite its massive size and imposing layout, the formation wasn’t discovered until 1987. While some scientists believe the entire monument is nothing but a natural phenomenon, other scholars seem certain that much of it is the handiwork of man. No one can debate that the Yonaguni Monument is thoroughly fascinating.

10. Mataking Island, Malaysia: The Underwater Post Office

If you’re tired of long lines waiting to ship a package, perhaps you’d prefer diving into the water in full SCUBA gear to check your mail. The underwater structure that houses this bizarre little post was formally used as a cargo ship. Now it’s an object lesson in conservation and creative tropical reef mail service.

Those were some of the most spectacular underwater structures. If you know of any feel free to drop a link.

note : We are running a giveaway at the moment. If you are looking to get your hands on a Wii along with Wii Fit Plus and more, take part in fixR Giveaway.