of the projects conceived for the suburban zone of Naucalpan was a development called Ciudad Satélite. The project was headed by architect Luis Barragán in 1958 and financially backed the Banco Internacional Hipotecario. The city's design and coordination was supervised by architect Mario Pani. It was designed to be a suburban community with a "green corridor" (highway lined by parks) connecting it to Mexico City proper. Attractive land prices created a boom market soon after the first units were sold in the mid 1960s, and over the next ten years, the green corridor disappeared. In addition to being a major bedroom community, it has been a major shopping district since the opening of the Centro Comercial Satélite in 1962. The Torres de Satélite were constructed by architects Luis Barragan and Matias Goeritz with the collaboration of painter Jesús Reyes Ferreira in the mid 20th century. The five sculptures form prisms that range in height from . They are located in the traffic circle of one of the busiest roads in the State of Mexico. They were constructed to be symbols of the vanguard of world class design in Mexico and as a "welcome" of the expansion of Greater Mexico City to Naucalpan. The Torres de Satélite have been catalogued by UNESCO as architectural heritage. The second best-known landmark in Naucalpan was recently demolished. The Toreo de Cuatro Caminos (lit. the Bullring of the Four Roads) was built in the 1940s in what was a hacienda. Over the years, the city built up and the area around the bullring became a major local transportation hub. The northwest end of the Mexico City Metro Line 2 ends here, at a large bus station which is only a couple of blocks from the Toreo. At the Toreo itself, fifteen local bus routes as well as buses to Toluca and other points west converge here. These buses clog the surrounding streets of Ingenieros Militares, Rodolfo Gaona and San Mateo. The domed roof of this bullring was a symbol of the city for many years, but in 2009, the demolition of this building began to make way for a commercial complex. Most of the bus routes have been relocated for the demolition and reconstruction, and a bus terminal is being considered for the area. Despite the loss of the building, the symbol of Metro Cuatro Caminos will remain a depiction of the dome. In addition