Designed by Frederick Law Olmsted and Calvert Vaux in the late 1850s, Central Park is a beloved refuge for 40 million New Yorkers and tourists each year. But most visitors are more familiar with the park's trees, fields and flowers than with its architecture and sculpture. The artists Andrew Zega and Bernd H. Dams, both trained architects who work together under the partnership Architectural Watercolors and are known for their intricate, authoritative and sometimes fanciful watercolors of buildings and gardens, have sought to change that. In their recently published book, "Central Park NYC: An Architectural View" ($75, Rizzoli), they document the park's monuments, pavilions, ornaments and statues, whether they're still standing as built, have been altered or have vanished altogether. Now, a two-week-long exhibition of the same name, featuring watercolors from the book as well as small-scale drawings by the artists, has opened at Didier Aaron in Manhattan. Ten percent of the proceeds from the exhibition will go to the Central Park Conservancy, which provides the bulk of the park's $58.3 million expense budget and is responsible for its operations and maintenance. "Central Park NYC" is on view at Didier Aaron, 32 East 67th Street, through Nov. 8.