text: It was opened in the winter of 1859 but not completed until 1873.
full_question: It was opened in the winter of 1859 but not completed until 1873. Sheep were actually kept in a particular part of it until the Great Depression when it was feared they would be eaten. It went into decline soon after it opened though due to lack of interest from Tammany Hall politicians. For ten points, name this 843-acre preserve designed by Frederick Law Olmsted that has featured concerts by Paul Simon, the Dave Matthews Band, and others in the core of the Big Apple.
first_sentence: It was opened in the winter of 1859 but not completed until 1873.