Tranquility Park uses open green spaces and a series of interconnected fountains to commemorate NASA's landing on the moon's Sea of Tranquility. These parks tie into the larger civic complex anchored by City Hall and the main branch of Houston Public Library.In the Historic District to the north, Market Square Park occupies a block formerly covered by Houston's open air market which fronted the old City Hall. Renovations completed in 2010 added two dog runs, a Greek restaurant, and Houston's only memorial to the September 11 attacks. Buffalo Bayou's route through Downtown contains multiple parks which segue together to form a continuous greenway. Allen's Landing, near the intersection of Smith and Preston, commemorates the landing site of the Allen brothers, the New York entrepreneurs who founded the city. Sesquicentennial Park, across Buffalo Bayou from Allen's Landing, commemorates the 150-year anniversary of the city's founding. The park contains a statue of former President George H. W. Bush, who represented a portion of west Houston during his time in the United States House of Representatives.In the Convention District, Discovery Green, immediately west of the George R. Brown Convention Center, contains an amphitheater, two restaurants, a dog run, a jogging trail, multiple lawns, and an artificial lake on nearly of land. Since its opening in 2008, Discovery Green has become one of Downtown's main attractions, hosting approximately 1.2 million visitors a year and serving as one of the city's premier public spaces. Discovery Green's environs, formerly covered by surface parking lots, have seen over US$600 million in new development since the park's opening. A number of other smaller parks and plazas are spread throughout Downtown. Main Street Square is a pedestrian-only promenade with a reflection pool and fountains on the METRORail line between Lamar and Dallas streets. Near the Toyota Center, Root Square occupies a single block and features a public basketball court. Harris County Precinct One operates the Quebedeaux Park near the county court complex. The park includes a stage area, picnic tables, and benches. The park surrounds the Harris County Family Law Center. A park in the southern part of Downtown, Trebly Park, began construction in March 2021 on the site of a former automobile repair center. The park had the provisional name Southern Downtown Park; its chosen name refers to how there are three street corners adjacent to the park. The area is in the shape of an "L". Entertainment