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. It opened on December 16, 2009 as a joint venture between MGM Resorts International and Infinity World Development. At 4,000,000 sq ft (370,000 m) 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 AAA five diamond hotel with 4,004 guest rooms and suites, 16 restaurants, 10 bars and nightclubs, and a casino with 150,000 sq ft (14,000 m) of gaming space. It also has a 215,000 sq ft (20,000 m) pool area with 50 cabanas, an 80,000 sq ft (7,400 m) salon and spa, a 300,000 sq ft (28,000 m) convention center and a 1,800-seat theater which currently hosts Viva Elvis by Cirque du Soleil.
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".