“Solitude is the school of genius,” the historian Sir Edward Gibbon once said. Which is why I’m here at this ÖÖD mirror cabin in the forested village of Lohusalu, 40 minutes west of Tallinn, Estonia.

Floor-to-ceiling glass-encased hotel rooms have traditionally been found only in urban, high-rise buildings. Until now. Seth and Tori Bolt, owners of Bolt Farm atop Whitwell Mountain in Whitwell, ...