Wimbledon Centre Court
The 60,000-square-foot retractable roof on top of Wimbledon's new Centre Court, created by the design firm Populous, means the end of rain-outs. The accordion-like fabric roof, which unfolds by way of nine 250-foot, court-spanning trusses, covers the open ground in seven minutes. The fabric, called Tenara, is tough enough to flex thousands of times, and it's 40 percent translucent. The court remains dry, but natural light still gives matches that outdoor feel.