A really really long banked track in Italy. One of the few places you can consistently hit speeds like that. I've heard a ton of cool stories from people who were there. Needless to say, from day one, the Europeans were stunned at what the blue oval car put down.
it made 212 at Nardo which is a curved track they said if it were straight it could get up to 215 and the engineers that worked on the GT said you could raise the rev limiter to get 218.