The
Gellért Hill Cave is part of a network of caves within
Gellért Hill in
Budapest,
Hungary. The cave is also referred to as "Saint Ivan's Cave" (
Szent Iván-barlang), regarding a
hermit who lived there and is believed to have used the natural
thermal water of a muddy lake next to the cave to heal the sick. It is likely that this same water fed the pools of the old
Sáros fürdo ("Muddy Baths"), now called
Gellért Baths.