Offering flights to the International Space Station, as well as suborbital excursions and dozens of related jaunts like centrifuge training, this respected outfitter is a one-stop shop for the serious space explorer. What's more, you needn't be a certified cosmonaut to get a feel for the experience. Thanks to programs like their Launch Tours, visitors can witness the crew of the Soyuz TMA-10 spacecraft soar into orbit, tour the Yuri Gagarin Cosmonaut Training Center in Star City, Russia and then make for the Baikonur Cosmodrome in Kazakhstan aboard Space Adventures' chartered jet.

For more information: www.spaceadventures.com

For $200,000 per person, SpaceShipTwo (built by Scaled Composites in Mojave, California) will carry just six passengers in reclining seats for the 2.5-hour flight to the edge of Earth (about 60,000 feet). There they can gaze at the curvature of the Earth and the cosmos above. Best of all, if you're a Virgin Atlantic frequent flyer, you can trade in your miles (all two million of them) for a free trip on Virgin Galactic.

For more information: www.virgingalactic.com

With 24 underwater suites, each featuring panoramas of breathtaking coral landscapes, this "seven-star" hotel will be entirely unique. The resort, which will initially only offer seven-day stays costing $15,000 per person, is spread over 225 acres of a private island in Fiji. If sleeping with the fishes isn't your style, you can choose to relax in a stilted bungalow over the sea.

For more information: www.poseidonresorts.com

Dubai's latest out-of-this-world project will be located just offshore, at a depth of 33 feet in the waters of the Persian Gulf. The $620 million Hydropolis Underwater Resort Hotel, designed by Munich-based architect Joachim Hauser, will be a bowl-shaped structure located in a man-made lagoon with 200 rooms and 30 suites, anchored to the seafloor. Set to open in late 2008 at $1,000 a night, Hydropolis will also include a concert auditorium and a 'beach' with artificial clouds and security by way of an anti-missile radar system. The company is also planning projects in Oman, Monaco, Las Vegas, Rio de Janeiro and China.

For more information: www.crescent-hydropolis.com

Offering half a dozen pricey expeditions, this stellar outfit will bring you face to face with the Titanic in the icy waters of the North Atlantic for $38,900 or take you on an 11-hour journey to rendezvous with the German battleship Bismarck off the coast of France for $29,000. The company also offers less extreme dives to the tropical wonders of Papua New Guinea's Solomon Sea.

For more information: www.deepoceanexpeditions.com