John Jacob Astor IV went down with the Titanic, but his Stanford White-designed estate in Rhinebeck, New York survives him. Stanford White's great-grandson Sam White has fully restored the place.

As soon as he realized that the Titanic had struck an iceberg on the night of April 14, 1912, John Jacob Astor IV sprung into action. He roused his pregnant wife, told her to put on her warmest ...