Burj Al Arab - one of the world's most luxurious hotels - aside from all the mystique and wealth it's known for, also has the highest tennis court in the world. Its space, located at 210 metres of altitude can also become a heliport for emergency landings or guest traffic.
Here are some pictures of the interior of this piece of heaven on earth.
Another extravagance from this sumptuous hotel, in Dubai, to which very few mortals have access. I confess, even if I was given access to it, I would have some difficulty in running around after a tennis ball at 210 metres above the ground.