The Building Museum has lots to offer for all visitors. When I’ve visited with my daughter, we enjoy just walking around the museum. There are several spaces other than the Great Hall or Building Zone which are toddler-friendly. The wide, shallow steps are great for little climbers, and the long arcades on the second (and third) floors were a delight for her little legs. The Commissioner’s Suite on the second floor, with a domed ceiling, was also a fun place to explore.