9. Union Square Park
Frederick Law Olmsted and Calvert Vaux were not the main architects for Union Square Park, though they were called in to replant the park in 1872. In the park’s early years, the square’s central oval was surrounded by a fence, while radiating walkways were lined with trees.
Olmsted and Vaux planted new trees to make the park an open glade as the surrounding area became more commercialized. Many of the mansions that surrounded the square were destroyed or converted into commercial properties around this time.