Christopher Walkup House — McHENRY COUNTY HISTORIC PRESERVATION LANDMARK This house was built on land purchased by Christopher Walkup in 1835. It was actually built by his son, William in 1869 the same year that Christopher died, so it is also commonly referred to as the William Walkup house. The square Italianate styled-house was pictured in the 1872 Plat Book of McHenry county and has been restored to much of its original appearance.