After pick-up in Sofia around 8:00 AM, head to Saeva Dupka, with 400 meters of corridors and 5 galleries. Explore the Harmana gallery's acoustic, stalactites, stalagmites, sinter lakes, draperies, and the largest stone column found so far in Bulgaria. Move on to Prohodna cave, one of the most famous caves in Bulgaria. See how it is naturally illuminated by two huge openings in the ceiling, inspiring the cave's local name, Eyes of God Cave. Explore the entrances, including a 45-meter entrance, the largest in Bulgaria.  Finally, see Devetaki Cave, northeast of Lovech. A picturesque karst cave, Devetaki stands at 2442 meters long and 60 meters high. It is one of the most beautiful caves in Bulgaria, full of stories from the Cold War to Hollywood productions. The cave is a protected landmark of national and international significance and has been declared a monument of culture.