Why locals love it
In the border area of Helsinki and Vantaa, a high rock rises, which is called Kalkkikallio. There are as many as four caves in the terrain of the Kalkkikallio cliffs to explore. The caves are called Ketunluola, Susiluola, Pirunluola and Keittoluola.
Why you should visit it
According to research by the Finnish Cave Society, Ketunluola is probably the largest cave found inside Ring Road III. It is worth packing a good lunch and exploring the natural architecture of the surrounding area.