Verla is a well preserved 19th century mill Finnish village and a UNESCO World Heritage Site since 1996.
I don't remember who sent the 1st two cards but the last one is a meeting card sent by Heidi.
Verla Groundwood and Board Mill, located in the northern part of the Kymi River Valley in southeast Finland, consists of the Mill, the associated residential area and the power plants. The mill buildings and the workers' houses mostly date from the 1890s and from the beginning of the 20th century. The property is a very well preserved example of a forest industry settlement of the late 19th century. Similar communities were established in coniferous forest zones in northern Europe and in North America, where wood as a raw material and water as a source of energy were easily at hand.
The first groundwood mill in Verla was founded in 1872 and the board mill began operations ten years later. The existing buildings, which are architecturally harmonious, date back to the turn of the 20th century. The mill itself ceased to operate in 1964, and all the machines and items related to production were left in the mill as they were when the production ceased. The buildings and the machines were carefully conserved and turned into a museum, and the Verla Mill Museum was officially opened in 1972.
The property itself consists of approximately 50 buildings in an area of 23 ha. The Verlankoski Rapids separate the production area from the residential area. On the rapids, there are three water power plants from three different decades, the newest one dating from the 1990s. The mill owner’s residence and a park from the late 19th century dominate the village. The sheer rock face above the rapids bears a prehistoric rock painting, representing fishing and hunting. - in: http://whc.unesco.org/en/list/751