San Diego, home to at least 3 Bugatti Veyrons, seen here at Symbolic in La Jolla
Here are the 3 I found... I'm impressed, that has to be over 3 million in rolling stock, and a good percentage of all the Veyrons produced so far.
For the open house tour of the Symbolic shop where repairs and restorations are done: http://choosingscars.blogspot.com/2008/03/symbolic-hosted-morning-meet-at-their.html