One of New York City’s most famous buildings, 30 Rockefeller Plaza boasts panoramic views from its sky-high observation deck, Top of the Rock. Visitors can access three levels for both indoor and outdoor glass-walled platforms offering unobstructed, 360-degree vistas of the sprawling metropolis. The skyscraper, which houses NBC headquarters, was formerly known as the GE Building and is now the Comcast Building.