Exterior and Treehouse Building Type Connected to the main house by a narrow bridge, a three-story cedar tower with a sauna at its base recalls a tree house. The screened-in second level includes a table and chairs for enjoying an outdoor meal, while a swing on the tower’s top level provides a perch to take in the surrounding birch trees.  Photo 2 of 13 in A Passive House and “Sauna Tower” Join a 19th-Century Barn in the Hudson Valley

A Passive House and “Sauna Tower” Join a 19th-Century Barn in the Hudson Valley

2 of 13

Connected to the main house by a narrow bridge, a three-story cedar tower with a sauna at its base recalls a tree house. The screened-in second level includes a table and chairs for enjoying an outdoor meal, while a swing on the tower’s top level provides a perch to take in the surrounding birch trees.