There was also an F1 GP held at Indianapolis between 2000 and 2007.
Here's an on-board view of an on-board lap in Australia:
http://www.youtube.com/watch?v=sOkvo5v5-VU
1400hp engine (in a car body weighing half-nothing), manual transmission (Senna would drive with 1 hand on the wheel a good chunk of the time), no electronic driving aids...pure driving. I've watched documentaries where he would make the car 'dance' in the rain and destroy everyone on the track.
One commentator described his cornering technique - Senna would flick the wheel in the direction of the corner before turning into the bend - allowing him to get the tightest possible racing line, so he would brake less than other drivers.
His famous heel-and-toe technique: