The exhibition Treasures of Pohorje presents a brief history of glassmaking on Pohorje and glass products from Pohorje glassworks. The development of glassmaking was made possible by natural resources, as quartz sand, wood and water power were abundant. From the 17th to the beginning of the 20th century, at least 16 glassworks operated on Pohorje, producing naturally coloured or translucent glass, as well as transparent (discoloured) and coloured glass, which was decorated by grinding, engraving and painting.

They produced a lot of ordinary utility glass: massive goblets, footed glasses, beer mugs and bottles for wine and cider, apothecary glass (medicine bottles, laboratory equipment), lamps, garden balls, liturgical utensils, packing glass... They also made large quantities of cut, engraved and painted glass, which was exported mainly to European countries and the Middle East.

In addition to local glassmakers and glassblowers, many German and Czech craftsmen worked in the glassworks of Pohorje. Glassmaking in Pohorje flourished in the first half and middle of the 19th century, but gradually began to decline in the second half of that century. The Treasures of Pohorje exhibition at the Hotel Planja is open to the widest range of visitors, who can learn about Pohorje's cultural heritage alongside its natural beauty.