The property, which includes the house and a 6.8 acres (2.8 ha) grounds now known as Marsh Botanical Garden, was declared a National Historic Landmark in 1965.Its architecture is reminiscent of the Jacobean revival, with asymmetrical massing, and a variety of projections, turrets, and decorative elements.It was designed for Marsh by J. Cleaveland Cady, and construction of the exterior of the main house was largely complete in 1878; it took another three years to finish the interior.He engaged in repeated expeditions into the American West, sometimes returning with spectacular finds of dinosaurs and other large vertebrates.His finds of Cretaceous winged dinosaurs, complete with teeth and other non-avian features, provided compelling evidence in the debate over the recently published theory of evolution by natural selection.