Diving for a ball could be deadly at the world's highest tennis court atop the Burj Al Arab hotel in Dubai. The hotel's helipad, 650 feet in the air, was converted to a special court for Andre Agassi and Roger Federer to play a match on in 2005. It's terrifying. The Burj Al Arab is the fourth-tallest hotel in the world (the three that rank above it are also in Dubai).
Link via Laughing Squid