The park is divided in two by the Serpentine. The park is contiguous with Kensington Gardens; although often still assumed to be part of Hyde Park, Kensington Gardens has been technically separate since 1728, when Queen Caroline made a division between the two. Hyde Park is 142 hectares (350 acres) and Kensington Gardens is 111 hectares (275 acres), giving an overall area of 253 hectares (625 acres), making the combined area larger than the Principality of Monaco (196 hectares or 484 acres), but smaller than New York City's Central Park (341 hectares or 843 acres). To the southeast (but outside of the park) is Hyde Park Corner. Although, during daylight, the two parks merge seamlessly into each other, Kensington Gardens closes at dusk but Hyde Park remains open throughout the year from 5 am until midnight.The park was the site of The Great Exhibition of 1851, for which the Crystal Palace was designed by Joseph Paxto