The Ainsworth House, also known as the Greet Ranch, was built in 1886 by homesteader Frank S. Ainsworth and his wife in Big Trails, Wyoming, in the Nowood Valley of Washakie County. The Ainsworths built the frame house after living in a tent and a log dugout. The house was one of the first permanent habitations to be built in the Bighorn Basin. The 1886 section of the house is a 1½ story framed and clapboarded building, to which was appended a 1½ story log house built in 1890 and expanded upward in 1911. The house was listed on the National Register of Historic Places in 1986.