Agroverzum is a hands-on science centre run on the Brunszvik estate, linked to Hungary's agricultural research tradition. It explains crops, soil, animal husbandry, and food production in a way that is aimed at families rather than specialists.
It is most useful if you have children with you, or if you want the Martonvásár stop to be more than Beethoven and palace architecture. For a short visit, pair it with the garden and museum rather than treating it as a separate destination.