The Caves of Aggtelek Karst and Slovak Karst is a UNESCO World Heritage site consisting of 712 caves spread out over a total area of 55 800 ha along the border of Hungary and Slovakia.
en.wikipedia.org/ wiki/Caves _of_ Aggtelek_ Karst_and_ Slovak_Karst
By the 4th century Pecs became the capital of Valeria province and a significant early Christian center. The early Christian necropolis is from this era which became an UNESCO World Heritage Site in December 2000.
The park a part of the Alföld Great Plain was designated as a national park in 1973 the first in Hungary and elected among the World Heritage sites in 1999.
en.wikipedia.org/ wiki/Hortobagy_ National_Park