Havana, by far the leading cultural center of the country, offers a wide variety of features that range from museums, palaces, public squares, avenues, churches, fortresses (including the largest fortified complex in the Americas dating from the 16th through 18th centuries), ballet and from art and musical festivals to exhibitions of technology. The restoration of Old Havana offered a number of new attractions, including a museum to house relics of the Cuban revolution. The government placed special emphasis on cultural activities, many of which are free or involve only a minimal charge.