This lounge offers panoramic views of sparkling landmarks including the Grand Palace and the Chao Phraya River, giving you an entirely different perspective on this exotic city. Vertigo is open daily from 5PM to 1AM (weather permitting), and also includes a dining section and private party lounge.

The Roof Gardens is a lush sanctuary teeming with exotic wildlife and themed gardens hoisted 100 feet above Kensington High Street. On the largest roof garden in Europe (1.5 acres), you can enjoy a flute of champagne in the Spanish Garden and gaze at the city's skyline for an otherworldly experience right in the heart of London, or unwind in the expansive English Garden that flaunts a pond with ducks and flamingos. Call ahead.

The original Tiffany Spire and the stellar Miami sunset are two of the major attributes of this refreshing Miami lounge designed by Todd Oldham. Roomy white sofas, brightly painted floorboards and the changing colors of the spire make nights here so enchanting you may never want to leave. Spire Bar's impressive drinks menu includes exotic concoctions like the Pink Champagne Martini and the Purple Manhattan ($15 each). The bar is open to the public from Thursday to Saturday, 6PM to 2AM.

Pale wooden decking, soft and roomy communal couches, flickering tea candles and cream tarps stretched overhead combine to make la Terrazza Rosé, the decadent open-air terrace at the St. George Hotel, one of Rome's most majestic gathering places. Located in the historical heart of Rome, the stunning terrace affords views of ancient domes and rooftops. La Terrazza Rosé opens on July 21 for the summer season from 7PM to midnight, Tuesday to Saturday (closed Sunday and Monday).

Nested on the 33rd level of the lavish Traders Hotel, the Sky Bar is an open-air den of Kuala Lumpur glamour. The opulent bar has a pool in the center and glass-paneled walls that reveal magnificent views. Relax with a crowd of businessmen and leisure travelers enjoying cosmopolitans and gaping at the lofty Petronas Twin Towers. Sky Bar is open from 5PM to 1AM, Sunday to Thursday (until 3AM on weekends and before public holidays).

It's hard to beat the views of downtown Manhattan from this exclusive open-air bar at 60 Thompson, a modern 100-room boutique hotel situated between Spring and Broome streets in Soho. Known among New Yorkers and well-informed travelers for its sexy atmosphere with a Moroccan flare, the rooftop is one of New York City's elite summer gems. The service is flawless and the crowd is full of elegant regulars who can't get enough of the stunning views. Open to hotel guests and members only.

The rooftop garden bar on the terrace of the 40-room Condesa DF Hotel, known for its bohemian chic, offers a lush escape from Mexico's frantic capital. Situated in one of Mexico City's most popular barrios, jetsetters and partygoers inundate the triangle-shaped terrace on weekends to enjoy the great cocktails with views of treetops and blossoming jacarandas. Whimsical and fresh, this outdoor bar captures the spirit of Mexico City.

Located on the penthouse level of Hotel Unique, Skye Restaurant & Bar has a fresh style with views of Ibirapuera Park and the skyline of Avenida Paulista. Designed by architect João Armentano, the eclectic bar is named after the band Morcheeba's lead singer, Skye Edwards. The bar is open to the public and features guest DJs and performances on special occasions.

It doesn't get more electrifying than the poolside bar on the roof of André Balazs' ultra-hip Standard Hotel in downtown Los Angeles. From this vantage point, LA's skyscrapers never looked so pretty. And it's hard not to fall in love with the fresh red and white décor, the futuristic waterbed lounges lining the pool, and the movies projected against the wall of an adjacent building. This is the place to sip a martini and talk shop with entertainment industry aficionados.

For more information: Rooftop Bar

Panoramic views of the Arabian Sea and the luminous string of lights forming the Marine Drive promenade make the Dome Terrace Sky Bar at the Intercontinental one of Mumbai's most romantic terraces. Roomy couches, soft red lights streaming through the lounge and billowing curtains create a stirring fusion of East and West in this moonlit open-air bar. Dome offers a noteworthy selection of premium wines, cocktails and cigars. On Tuesdays and Thursdays, live musicians play along with the electronic music wafting through the lounge.

The Espresso Martini, the Lavender Margarita and the Black Mojito are just a few of the cocktails you'll want to try on the swanky rooftop terrace of the historic Hotel Reina Victoria, now operating as the ME Madrid. Headed by Rande Gerber, this happening bar marries the warmth of Latin culture with the coolness of a contemporary nightclub. The lounge stays open until 3AM, with tapas available until midnight, and regularly features live music.