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.

Belvedere Castle Belvedere Castle is one of Central Park's five visitor centers. Calvert Vaux, co-designer of the Park, created the miniature castle in 1869 as a whimsical structure looking out on the reservoir to the north (now the Great Lawn) and the Ramble to the south. Belvedere provides the highest and best views of the Park and the adjacent cityscape. The castle's name is fitting, because it translates to "beautiful view" in Italian. "Right now, the temperature in Central Park is...." That information, heard frequently on radio and TV, originates here at Belvedere Castle. Since 1919, the National Weather Service has taken measurements of New York's weather from the castle's tower with the aid of scientific instruments that measure wind speed and direction. In a fenced-in compound just south of the castle, other weather data such as rainfall are recorded and sent to the weather service's forecast office at Brookhaven National Library on Long Island. After decades of deterioration, Central Park Conservancy renovated and reopened the castle in 1983 as a visitor center and gift shop.

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.

Looking over Turtle Pond to Belvedere Castle and Vista Rock, c. 1976. Vista Rock is a 130 feet high formation of Manhattan schist. It is the second highest outcrop in Central Park. The massive rock formation sits in the path of the 79th Street Traverse, one of the four roads that Olmsted and Vaux designed for the Park. To complete the planned roadway, gunpowder was used to blow out the path for a tunnel. The Vista Rock Tunnel is 146 feet long, 40 feet wide, and just under 18 feet at the center.

By Cynthia Brenwall The collection of Parks Drawings at the Municipal Archives are often called the “jewel in the crown” within the holdings. It includes hundreds of exquisite plans and designs of parks throughout the city and in particular, Central Park. Originally created to illustrate the park designers’ intentions and to guide those who built the parks, many of these drawings are now considered works of art. Some are again being utilized as “working” drawings, providing essential information for on-going restoration projects in the parks. One of the most visible of the recent projects is the Belvedere Castle. The original format of this story can be found with other excellent blogs: here.

Over the years, more than a few New Yorkers have taken the phrase "A man's home is his castle" literally. This tour takes you through a few of the fortifications that New Yorkers have built for themselves.

New York City is one of the most photographed places in the world. With globally-recognized icons like the Statue of Liberty and Empire State Building, this collection includes some of the city's most popular spots to recreate a historic photo, along with a few underrated gems. Remember, tag your photos on social media with @museumofcityny and @urbanarchiveny for a chance to have your before/after photos featured!