MICHIGAN John T. Greilick The Detroit News May 3, 2026, 12:06 a.m. ET View Comments If you've traveled north of the Mackinac Bridge anytime during the past 100 years, you've surely seen Castle Rock. This isn't the fictional New England town of Castle Rock, Maine, where all sorts of creepy supernatural things happen in author Stephen King's novels, but rather a massive column of limestone rising about 200 feet above nearby Lake Huron.