Kolkina Dupka is the longest cave in Bulgaria with 19,164 meters of underground galleries. Until now, Duhlata in Vitosha mountain with 18,200 meters of galleries was considered the longest in the country. This is what speleologists..
Not far from the village of Bosnek located 40 km from the capital Sofia, flows a miraculous spring in whose waters many people seek healing and solace. It is also known as the Fountain of Happiness after Ottoman traveller Evliya Celebi gave it..
