Caldicott, also known as Vessey House and Essex Farm, is a historic home located at Rehobeth, Somerset County, Maryland, United States. It is a large frame dwelling constructed between 1784 and 1798 by Littleton Dennis Jr. The house stands two stories above a raised basement of Flemish bond brick. Also on the property are a gambrel-roofed barn, sheds and storage buildings, and a water tower. Caldicott was listed on the National Register of Historic Places in 1983.