People call Kamyanets-Podilsky a city-museum under the open sky. It is one of the most ancient cities of Ukraine with almost millennial history. There are more than 200 architectural monuments here. The main place of interest is an ancient fortress, one of the Seven Wonders of Ukraine. The first stone structures of the fortress date back to the 11th and 12th centuries and the main fortifications refer to the 16th and 17th centuries. The permanent defensive works of Kamyanets-Podilsky are considered to be an outstanding example of the best fortifications in Eastern Europe.