This modernist estate, designed by the late architect and builder and I.M. Pei protégé Vuko Tashkovich, plays off geometric forms to maximize light. One of Tashkovich’s final completed works, the Pound Ridge Residence is a grand property created for William Rubin, the former curator of paintings and sculptures at the Museum of Modern Art (MoMA). Tashkovich’s original design was expanded by Rubin and his wife, curator Phyllis Hattis, to include additional space to display their art collection. Seen here is the indoor saltwater pool.