Dedicate your second day to exploring the historic center of Belluno. Start with a visit to the Palazzo dei Rettori, a stunning palace that houses the Civic Museum. Discover the rich history and art of the region through the museum's exhibits. Next, head to the Duomo, Belluno's cathedral, known for its beautiful frescoes and panoramic views from the bell tower. Take a leisurely walk along the medieval walls that surround the city, offering picturesque views of the surrounding mountains. End your day with a relaxing dinner at a local trattoria.