17. Elk Mountain Lodge combines the rustic style of Aspen, Colorado, with unmatched design details. Billionaire businessman Bill Koch first listed the 80-acre property for $100 million in 2015, but it has since received a price cut.
Price: $80 million
The compound includes 12 buildings on 82 acres, with the 14,000-square-foot main house at the center of it all. Two serene trout ponds and miles of surrounding wilderness make it a nature lover's paradise.