Field Farm is a 316-acre (1.28 km2) nature preserve and farm in Williamstown, Massachusetts, managed by the Trustees of Reservations. There are 4.5 miles (7.2 km) of hiking trails on the reservation, which pass by swamp land, a pond, and the "Caves Lot" which features underground channels that water had cut into the limestone there. An International Style house, built in 1948 by Edwin Goodell, is operated as a bed and breakfast inn. Also on the site is The Folly, a small guest house designed by Ulrich Franzen in 1966. The Folly is currently open for guided tours. The property also contains a sculpture garden.