Astrodome, Multi-purpose stadium in Houston, United States

The Astrodome is a circular domed stadium in Houston, 18 stories tall and covering 9.5 acres (3.8 ha). Its roof is 710 feet (220 m) in diameter, with a ceiling 208 feet (63 m) above the playing surface, which sits 25 feet (7.6 m) below street level. The dome's alternating pale and dark radial panels converge at the top, above a band of dark rectangular windows and a tall, pale curved wall.

Roy Hofheinz, a former Houston mayor, pushed for a covered stadium after rainouts at Buffalo Stadium and a tour of Rome's Colosseum, where a fabric awning shielded spectators. Construction began in 1963 and the Harris County Domed Stadium opened in 1965, nicknamed the "Eighth Wonder of the World". It was renovated in 1988–1989, closed to the public in 2009 and was listed on the National Register of Historic Places in 2014.

The Astrodome hosted the Houston Livestock Show and Rodeo from 1966 to 2002, and Selena gave her last televised concert there on 26 February 1995. Elvis Presley played six shows in February and March 1970 to a combined 200,000 spectators. The 1973 "Battle of the Sexes" tennis match, in which Billie Jean King beat Bobby Riggs, was also held here.

The Astrodome has been closed to the public since 2009 and now serves as a storage facility for the surrounding Reliant Park. Visitors cannot go inside, but the dome and its ribbed roof panels can be viewed from the parking lots and streets around the complex. Parts of the structure were demolished in 2013.

The Astrodome's ceiling sits 208 feet (63 m) above the playing surface, which itself lies 25 feet (7.6 m) below street level. The dome spans 710 feet (220 m) in diameter, and the building stands 18 stories tall on a 9.5-acre (3.8 ha) site.