Burj Al Arab in Dubai is home to the world’s highest tennis court (at times). At 210 meters (about 690 feet), it’s pretty far up there. Way The court doubles as a landing pad when there aren’t any matches being played.
Video of Andre Agassi and some other guy playing tennis up there after the jump. I like how at the end they just start wailing balls off of the side trying to hit things. Because that’s what I would do.