Twelve kilometers west of San Diego de los Baños via Parque la Güira is the Cabañas los Pinos, an abandoned mountain retreat used by Castro's secretary Celia Sánchez in the 1960s. The cabins are built like tree houses above the ground with Sánchez' circular abode standing in the center of the eerie complex.
It's another rather surreal curiosity that gets few visitors but is worth a spare hour or two of silent contemplation. Ask at Hotel Mirador for directions.