The best site for skydiving is United States Parachute Association. They have everything you need to get you closer to your dream. If you're looking for skydiving in a particular area check out the drop zones list on their site and it will help you locate skydiving providers.
Joseph_Kittinger "Longest and Highest Freefall in the world" August 16, 1960 he jumped from an altitude of 102,800 feet. Freefell for 4½ minutes and reached a speed of 614 mph before opening his parachute at 18,000 feet. That was the real skydiving world record.