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The Park Hyatt Tokyo's sleek, 47th-floor swimming pool has jaw-dropping vistas of Tokyo and even venerable Mount Fuji.

The 65-foot-long, four-lane pool at the Park Hyatt Tokyo is striking at night, when the city outside comes to life.

You can take small sailboats out on the saltwater pool at San Alfonso del Mar, in Algarrobo, Chile. The pool measures two thirds of a mile in length—Guinness World Records calls it the largest in the world.

For nighttime swimming at San Alfonso del Mar, head to the temperature-controlled beach inside the pool's centrally located glass pyramid—the water and the sand are heated.

The Hotel Caruso Belvedere is set at the highest point in the sun-splashed Amalfi Coast town of Ravello, Italy, so the open-air infinity pool offers unobstructed, panoramic views of one of the world's most dramatic coastlines—and the sea beyond.

Inside the massive, 347-room Umaid Bhawan Palace, this serene, temperature-controlled swimming basin takes advantage of natural candlelight.

The two-acre pool deck at the Viceroy Miami features Japanese blueberry trees, swanky chaise lounges and beds, and three types of pools: an 80-person hot tub, a wading pool, and a football-field-size swimming pool.

The Viceroy Miami's pool is 15 floors above the street, with in-the-middle-of-it-all views of downtown Miami and glimpses of Biscayne Bay in the distance.

Set on the third floor of the InterContinental Hong Kong, the hotel's three pools—two hot and one cold, but all with underwater music piped in—give the almost unnerving illusion that you're floating in Victoria Harbor.

You'll swim with five species of sharks (16 sharks in all!) at the Golden Nugget's $30 million pool complex in Las Vegas.

Take a waterslide straight through the Golden Nugget's 200,000-gallon shark tank. You'll see stingrays, massive Queensland grouper, and silvery jack crevalle, too.

The Quincy Hotel's pool suspends swimmers 12 floors above Singapore's passing cars and pedestrians at street level.

The Al Bustan Palace InterContinental Muscat in Oman has a spacious, 164-foot-long infinity pool flanked by shady, palm-studded islands. The water is temperature controlled, so it's always an oasis-like 84 degrees.

You look straight out into the Gulf of Thailand from the Anantara Koh Samui Resort & Spa's 98-foot-long infinity pool at this stylish resort on the island of Samui.