Narva is a city with a rich and interesting history. The city's location made it a fortress on the border between East and West and it survived many wars and devastations, but it was always rebuilt and developed again. At various times the city was under the rule of the Danes, the Livonian Order, the Swedish Crown, the Russian Empire, the Nazi Germany, the Soviet Union, until it finally became part of an independent Estonia. The fortress, the port, the center of trade, the industrial center - from century to century, the significance of the city changed and all these roles left a trace in the history of Narva. Here, every stone and every hummock is saturated with interesting historical details. Like an invisible puff cake, the city keeps fascinating details of the lives of people who have lived here for centuries. Quests and excursions with the help of the mobile application Questcity - a great opportunity to open your eyes to these invisible secrets, legends and stories of the city of Narva.