Belvedere Castle, Central Park, 1905

Belvedere Castle was designed by Calvert Vaux in 1869 as a Victorian "folly," a whimsical structure having no practical function. It has since acquired the practical function of housing meteorological equipment for the National Weather Service. Its turret is the highest point in Central Park with views of (at the time of this photo) the Reservoir to the north and the Ramble to the south.