Oman Across Ages Museum is a major modern museum near Nizwa, designed to tell the country's story from geology and early settlement through state formation and contemporary Oman. It is one of the best indoor cultural stops in the interior.
The building itself is part of the experience, with sharp contemporary architecture set against the dry landscape around Manah. Pair it with Nizwa Fort and the souq for a fuller picture: old imamate capital, living market town, and national narrative in one trip.