Spring Mountain has been around for a long time, nearly 20 years. However, it was just a strip of asphalt for many years.
A group of 6 or 7 of us rented it one day for a bit over $1k once in the early years. Unlimited track time! We thrashed for hours out there, got tired, had lunch, and repeated it in the afternoon. Lots of fun.
It's much more civilized, and infinitely more expensive now. However, the improvements are really nice.
'11 E90 M3, Mebourne/Black/Fox Red/Black, 6MT, PP2, heated seats, moonroof, split folding rear seats, iPod/USB adapter, Technic harness, JL XD 6/600.
'02 E46M3, Imola/Black, 6MT, CWP, no sunroof, Ohlins, Eibachs, PFC DD rotors, PFC pads! HAT Clarus/Legatia speakers, 2 big amps in the back.
'05 X5 4.4i, Imola/Black, Premium, Cold, HAT Imagine 6.5's, Intravee iPod adapter