One of my favorite houses in the world, the Villa Erba sits along Lake Como in Cernobbio, Italy. Originally a convent, it was purchased by the Erba family in 1882 and remained in the family until 1986. One of the heirs to the property was film director Luchino Visconti, who shared it with his brother and lived here until his death in 1976.
The Visconti family sold it to a consortium who turned it into an event center, restoring the villa in 2003. Splendid job, I'd say, and a great place for a party.