He also established the 13,000 acre (53 km²) Santanoni Preserve on Newcomb Lake in the Adirondack Mountains upstate of New York, which is today a state park and National Historic Landmark. After President William McKinley was shot in 1901 at the Pan-American Exposition in Buffalo, then vice president Theodore Roosevelt traveled to Buffalo to visit McKinley in the hospital. As it appeared that McKinley would recover, Roosevelt went on to Santanoni as Pruyn's guest; the two were old friends. When McKinley's condition worsened, Roosevelt left directly from Santanoni to Buffalo where he was inaugurated as the 26th President of the United States.