The "Fox River Grove Castle" is located near the Union Pacific railroad racks and US 14 in Fox River Grove, Illinois. Built by an engineer homesick for Luxemburg. Not a National Registered Historical Site. In McHenry County. Also called Bettendorf Castle. Theodore Bettendorf, who played in the original Vianden Castle in Luxembourg as a child, started building the castle in 1931, remained a bachelor and built for over 30 years. Sometimes it was used for weddings, etc. but it has always been a private residence. Current owner likes his privacy, but "gave me permission" to photograph from the public street. – Smallbones, Public domain – Wikimedia Commons Fox River Grove is located in Illinois. About 4,702 people live here (as of 2020). Between 2010 and 2020, the population declined from 4,854 to 4,702. There are about 165 streets in Fox River Grove. The region was founded in 1919. The postal codes are 60021. The dialing code is 847. The license plate code is 847. Fox River Grove is village in McHenry County, Illinois, United States of America. Among other things, Fox River Grove has public Transport, attractions and schools. More information at www.foxrivergrove.org.