Satorkopuszta Cave is a protected cave in the hills near Esztergom, known for mineral formations rather than vast chambers. It offers a very different outing from the basilica, castle hill, and riverside sights in town.
Access is controlled, so check current visiting arrangements before setting out. If you can join a visit, the cave makes a good half-day nature add-on for travellers who have already covered Esztergom's historic centre.