Ujjayanta Palace is Agartala's grand landmark, a white domed palace set amid ponds and gardens. Built by the Manikya dynasty, it now contains the Tripura State Museum, whose galleries are the best introduction to the state's history and communities.
Go early in your trip. The palace gives context for Neermahal, the old capital at Udaipur, and Tripura's mix of courtly, tribal, and Bengali cultural strands.