The Riviera was a hotel and casino on the northern Las Vegas Strip in Winchester, Nevada. It opened on April 20, 1955, and included a nine-story hotel featuring 291 rooms. The Riviera was the first skyscraper in the Las Vegas Valley, and was the area's tallest building until 1956. Various hotel additions would be made in later years, including a 12-story tow…The Riviera was a hotel and casino on the northern Las Vegas Strip in Winchester, Nevada. It opened on April 20, 1955, and included a nine-story hotel featuring 291 rooms. The Riviera was the first skyscraper in the Las Vegas Valley, and was the area's tallest building until 1956. Various hotel additions would be made in later years, including a 12-story tower in 1966, a 17-story tower in 1975, and a 24-story tower in 1988. By the time of its closure in 2015, the resort included a 103,800 sq ft casino and 2,075 rooms.