Ski Dubai!

The area of this thing (5.5 Acres) is only about 2/3 the size of the superdome, but they bring the temp. down to below 35F, w/ an outside temp. of as high as 120.
http://www.skidxb.com/English/facts_eng.htm?mid=1&sid=2

Impressive. By my calculations, the cost of an adult all-day pass works out to be around $74 - not cheap, but a bit less than I would have expected.

There was a show on Discovery about the making of this. Pretty interesting stuff.