In a regular column for 2025, journalist Margaret Littman highlights unusual luxury travel experiences, particularly those that are an easy trip from Nashville. You certainly can go to Bolt Farm Treehouse on your own (I spent a meditative birthday weekend there) or with a group of friends. But where this luxury hideaway really shines is as a romantic destination with your sweetie. Located in the Sequatchie Valley in Whitwell, Tenn., just a stone’s throw from Chattanooga, Bolt Farm is unlike any other high-end getaway…