Zsitvay Observation Tower stands on Nagyvillám above Visegrad, giving a wider hilltop view than you get from the citadel alone. On a clear day the Danube Bend, the Pilis and Börzsöny hills, and even the distant outline toward Budapest line up in one broad sweep.
It is a good add-on if you are hiking above town or already heading up to the citadel area. The tower itself is simple, but the setting explains why this corner of the Danube is one of Hungary's easiest and best day trips from the capital.