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Built in 2010 in Ozarks, Pensmore is a 72,000 sq ft fortress designed for disaster resistance. Featuring 13 bedrooms, 14 bathrooms, secret passages, and award-winning insulated concrete walls, this high-tech mansion looks more like a modern castle.
Montana: Cromwell Island Palace — An Exclusive Fortress
On Cromwell Island, Montana, a 45,000 sq ft private estate started in the 1990s but remains incomplete. Surrounded by wilderness, it's a rustic mansion with fortress-like stone walls, mountain views, and private boat access, known as "Neverland of Montana."