The clear water
You see the floor six metres down.
Shaambo.ghosh — CC BY-SA 3.0 · Solymári — CC BY-SA 4.0 · Unknown authorUnknown author — Public domain · Szenti Tamás — CC BY-SA 4.0
You row beneath a town: Tapolca's famous cave is a system of passages flooded with clear thermal water under the streets, found by accident in 1902 while digging a well — today you take a small two-oar boat and push yourself along the walls through three hundred metres of chambers, the water beneath you transparent to a floor six metres down. The trip takes twenty minutes in silence at a steady 20 degrees (relatively warm, because the water is thermal), the chambers dissolved out of limestone between cold water from above and thermal from below. Entry is through a small geology museum, and the ticket includes the neighbouring "hospital cave" where asthma patients are treated by its air. In Tapolca's centre itself a mill pond sits in the square with cafés around it — a half-day stop between Badacsony and Hévíz.
You see the floor six metres down.
In the town square with its cafés.
Kisfaludy utca 3, Tapolca
Passages are low in places and you duck; the trip is short and the boat open, but the severely claustrophobic should skip it.