$ 330,000.00 USD is the price tag.
See it here: http://www.youtube.com/watch?v=UyT-Esr2b3k
It is a virtual space station inside a virtual world ( entropia universe ) which is well known for its "real cash economy," where $1 can buy you 10 PEDs (Project Entropia dollars) in the virtual world.
More info on http://mashable.com/2009/12/31/crystal-palace-space-station-sale/
Sidenote: Who wants to start a virtual game? Looks like there are plenty of money to be made :D
I used to play Entropia Universe all the time, actually made some money at it (down to investing when the £ was strong against the $ and selling out when it was weak). Its a fun game, completely open ended, no missions or quests, you just go out there and hunt, mine, trade etc.
Richard