One of the longest caves in Serbia, patiently created and skillfully modeled by nature for over two million years, is still an enigma for scientists and explorers of different profiles because they know where it starts but nobody knows where it ends.

God's Bridge is a natural phenomenon in the karst region between the villages of Lilyache and Chiren, about 15 km north of the town of Vratsa. The karst region of Chiren-Lilyache includes many water caves, karst springs, streams, and rivers. Since it was not built by human hands, but rather a work of nature, people called it God's Bridge.

The natural landmark Ledenika cave is located within the boundaries of the Vrachanski Balkan Nature Park, where some of the most interesting caves and chasms are located - about 500. The caves are one of the natural wonders of the world, and their unique underground beauty is created for millions of years.

Magura Cave is a remarkable archaeological site located in northwestern Bulgaria, near the village of Rabisha, Belogradchik Municipality. It is one of the most famous caves in the country and holds significant historical and cultural value.

The Belogradchik Rocks, also known as the Belogradchik Cliffs, are a spectacular group of rock formations located in the northwestern part of Bulgaria, near the town of Belogradchik. They are one of the country's most famous natural landmarks and a popular tourist attraction.