Sitting on Vista Rock, one of the highest points in the park, Belvedere Castle offers spectacular views of Central Park, especially towards the north. This charming location is a favorite among photographers and boasts a visitor center along with a nature conservatory.
Right beneath the castle, to the north, lies Turtle Pond. This small, swamp-like pond is home to a variety of wildlife, including fish, frogs, insects, and birds. It adds a serene touch to the bustling surroundings and provides a peaceful retreat for nature lovers.
Source - https://en.wikipedia.org/wiki/Belvedere_Castle