There are a total of five caves in Medieval Dynasty which are often found in mountain areas or on slopes. There are caves near Braniica, Lesnica, Jezerica and Hornica. You can look at the map below to find out more.
Note that without a flashlight you cannot see well in Medieval caves as expected. These caves contain valuable ores like Copper, Tin, and Salt which you can extract with the help of pickaxe.
Also while entering caves you can meet bears which are one of the toughest enemies in the game, so try to find a safer cave instead of fighting them.
Medieval Dynasty on G2A