new ` skywalk ' observation deck has opened to the public in yunyang county , southwest china .
the cantilevered platform in chongqing has a 720 degree view from a vantage point that stands nearly 4,000 feet above sea level .
its incredible viewing area protrudes nearly 90ft from the cliff face at the longgang scenic area - which is more than 16ft longer than a similar tourist attraction at the grand canyon in america that