Budapest is not just known as the city of spas its also known for its natural caves. In fact, its the the only capital city that has caves underneath the centre of the city.
For those seeking a bit of an adventure, go caving and discover these natural beauties. There are a number of tour types depending on what experience you are after. The length of some can stretch between 2 - 4 hours. Get to ready to explore some hydrothermal caves that relate to the thermal springs that supply the famous spas in Budapest.