land, making it almost twice as large as Central Park in New York City. The park is home to five major institutions, including the St. Louis Art Museum, the St. Louis Zoo, the St. Louis Science Center, the Missouri History Museum, and the Muny amphitheatre. Another significant park in the city is Gateway Arch National Park, which was known as Jefferson National Expansion Memorial until 2018 and is located on the riverfront in downtown St. Louis. The centerpiece of the park is the tall Gateway Arch, a National Memorial designed by noted architect Eero Saarinen and completed on October 28, 1965. Also part of the historic park is the Old Courthouse, where the first two trials of Dred Scott v. Sandford were held in 1847 and 1850. Other notable parks in the city include the Missouri Botanical Garden, Tower Grove Park, Carondelet Park and Citygarden. The Missouri Botanical Garden, a private garden and botanical research facility, is a National Historic Landmark and one of the oldest botanical gardens in the United States. The Garden features 79 acres of horticultural displays from around the world. This includes a Japanese strolling garden, Henry Shaw's original 1850 estate home and a geodesic dome called the Climatron. Immediately south of the Missouri Botanical Garden is Tower Grove Park, a gift to the city by Henry Shaw. Citygarden is an urban sculpture park located in downtown St. Louis, with art from Fernand Léger, Aristide Maillol, Julian Opie, Tom Otterness, Niki de Saint Phalle, and Mark di Suvero. The park is divided into three sections, each of which represent a different theme: river bluffs; flood plains; and urban gardens. Another downtown sculpture park is the Serra Sculpture Park, with the 1982 Richard Serra sculpture Twain. Government St. Louis is one of the 41 independent cities in the U.S. that does not legally belong to any county. St. Louis has a strong mayor–council government with legislative authority and oversight vested in the Board of Aldermen and with executive authority in the mayor and six other elected officials. The Board of Aldermen is made up of 28 members (one elected from each of the city's wards) plus a board president who is elected citywide. The 2014 fiscal year budget topped $1 billion for the first time, a 1.9% increase over the $985.2 million budget in 2013. 238,253 registered voters lived in the city in 2012, down from 239,247