Block House No. 1. This stone fort, which sits on top of the large rock, is the oldest original structure in Central Park (Cleopatra's Needle was created elsewhere and moved). It is one of a number of fortifications built in the area during the War of 1812 (and the only one that survives). Despite the threat that prompted their construction, none of the forts were used in wartime combat and they were abandoned when the war ended, soon after being built. It was later used for ammunition storage.

While New York City is certainly best known for its towering skyscrapers and classy historic districts, its earliest monuments of stone are just that: stone. The geologic landscape of the city was formed between 20,000 and 18,000 years ago with the movement of the Wisconsin Ice Sheet down from Canada. The rock and debris deposited from the ice sheet, as well as the valleys it deepened, bedrock it smoothed and glacial grooves it left, formed the landscape of the city that began to grow in the colonial era. In some cases the rocks have been moved or crumbled in the name of urban development. But some of this geologic history can still be seen within the urban environment. This collection highlights some of the more well-known geologic features.

The upper portion of Central Park is perhaps the less visited section of New York's man-made oasis but includes some lovely areas. Take a look at some of the lesser-known spots in the park.