The cornerstone for the Bahá'í House of Worship in Wilmette, Illinois was brought to the site by Nettie Tobin and accepted in 1912 by ʻAbdu'l-Bahá during his only visit to the United States and Canada. Construction began in 1921 and was completed in 1953, with a delay of several years during the Great Depression and World War II. The Wilmette House of Worship is the largest and the oldest surviving Bahá'í House of Worship. Known by Baha'is as the "Mother Temple of the West" and formally as the "Bahá'í House of Worship for the North American Continent", it stands in north suburban Cook County, on the shores of Lake Michigan, at . The cladding is made of white portland cement concrete with both clear and white quartz aggregate. It has received numerous design awards, and is a prominent Chicago-area landmark. In 1978, it was added to the National Register of Historic Places.