Check out Panikotha Fort and learn about its role in defending the area. This structure has witnessed some interesting history in its time.
You'll have no end of sightseeing choices when staying in Dadra and Nagar Haveli and Daman and Diu. Panikotha Fort is a great place to begin here, but there are plenty of other worthy places to consider. Nagoa Beach, Diu Island and Diu Fort are near the history-filled fortress and will top off your day nicely.