In Naples, Fla., I met a self-made man, a multimillionaire,...

In Naples, Fla., I met a self-made man, a multimillionaire, whose round penthouse apartment is home to Pierre-Auguste Renoir, Claude Monet, Henry Moore, and Mickey Mantle. He had purchased the most coveted items auctioned by the Mantle family at Madison Square Garden in December 2003.