Boston's Splash Ultra Lounge, which opened in late 2009, has a roof deck with private cabanas, a decorative fountain, a DJ area, and a full bar.
Photo: Matt Badelli Photography
The Thompson Toronto, which opened in June, has an infinity pool on the 16th floor.
Photo: George Pimentel
One of last year's major new hotels in Washington, the W Washington D.C. has an 11th-floor rooftop bar overlooking the White House called POV Roof Terrace.