From TMZ:  Elin Nordegren -- the very rich ex-wife of Tiger Woods -- apparently has an acute case of Stockholm Syndrome -- because she can't shake her Swedish roots.

Take a gander at the 21,000 square foot mansion she's building in North Palm Beach, FL ... with a Swedish flag firmly planted atop one of the chimneys.

You may recall, Elin bought the home with the $100 mil she got in the divorce settlement.  She paid $12.2 mil, then promptly knocked down the existing 17,000 square foot home and built a shiny new one.

Good news ... the pool, spa and koi ponds are now completed

Read more: http://www.tmz.com#ixzz2ElCQoyeQ