@Moss Mansion Our most popular behind-the-scenes tour is back! Spend extra time exploring the mansion beyond regular tours with a seasoned Site Historian. Peek into closets, examine fragile documents, and really dive in to the lively past of the Moss Mansion. Explore for hours from the basement all the way to the attic where other daily tours don’t go. Take this exclusive tour through artifacts and decor from the early 20th century and hear the stories and lore surrounding the development of Billings, Montana and the Moss family. Trunks & Treasures are scheduled the first Sunday afternoon most months, as available. Admission is $30 per person with a reservation at least three days in advance, limit 12 guests per tour.