Aria Resort & Casino is a luxury resort and casino located within the CityCenter complex on the Las Vegas Strip. Aria consists of two curved glass and steel highrise towers adjoined at the center. At 4,000,000 sq ft (370,000 m2) and 600 ft (180 m) in height, it is the largest and tallest structure at CityCenter. The resort's 61 and 51-story towers contain a hotel, restaurants, bars, nightclubs, a casino and a 1,800-seat theater. It also has a 215,000 sq ft (20,000 m2) pool area, spa and convention center. Among the most notable aspects of Aria is its incorporation of technology in the exterior and interior design of the hotel, specifically for the reduction of energy consumption. It is the largest hotel in the world to have earned LEED Gold certification. On account of its smart rooms which automatically adjust curtains, turn off unused lights and electronics, and regulate the temperature when a guest enters or leaves a room, Aria was described in Popular Mechanics as possibly 'the most technologically advanced hotel ever built'.