Szt. Istvan cave
This beautiful limestone cave is located in Lillafüred, Hungary. The cave is about 710 m long and was discovered in 1913. And opened for the public in 1931.
The cave is still being explored, but only a part can be visited. Its deepest known area is named Hell. The most beautiful dripstone structures are the Mammut's Mouth, Fairyland, Column Hall and Concert Hall.
The air in the cave is very clear and has a high humidity. Patients with respiratory illnesses are treated here.