AFTER MORE THAN 20 YEARS OF PLANNING AND construction, Cary, North Carolina, has turned a 3 hectares section of its downtown into one of the country's most multifaceted public parks. OJB Landscape Architecture designed a mix of active recreation areas, botanical gardens, pavilions, event spaces, cafés, bars, and cleverly camouflaged floodwater retention basins. Those basins—including several rain gardens and a central pond—hold back the flooding that had regularly ravaged neighbourhoods to the south. A creeklike children's splash pad plays up this connection to water, and winding elevated walkways overhead highlight the site's dramatic 11 metres elevation change. Hundreds of trees, including 600 new ones, provide a lush respite in the city centre. Built for $65 million in bond funding, the park has created a gathering space for Cary's 150,000 people.…