The 4.3 acre (1.7 hectare) Fort Worth Water Gardens, designed by noted New York architects Philip Johnson and John Burgee, is an urban park containing three pools of water and terraced knolls; the Water Gardens are billed as a "cooling oasis in the concrete jungle" of downtown. Heritage Park Plaza is a Modernist-style park that was designed by Lawrence Halprin. The plaza design incorporates a set of interconnecting rooms constructed of concrete and activated throughout by flowing water walls, channels, and pools and was added to the US National Register of Historic Places on May 10, 2010.