Verla is typical old factory in Finland, located next to a river, which provided power. It is located ca 30km from Kouvola, easiest to reach by own/rented car. There is public bus connection during the summer.
Area contains several old original buildings, making it really worth a trip. It is unique World Heritage Site, only one presenting forest industry and paper making. There is mansion, power plant, factory and employee accommodation. Additional few shops and restaurant.
You can learn a lot about paper production at the museum.
Summary: As an unique place, worth detour or even own trip.

The site is wonderfull, everything is like it was left tens of years ago. The guide had interesting stories to tell, including one lady who worked there for years and years on the same position and had even left markings on the floor during the years.

But in the evening, just before the sun goes down and everyone else has gone. Only seagulls screaming and the powerplant humming. That is the time to just sit, watch and think how different things were decades ago.

If you visit Finland, you have to visit Mill that shows you what is very Finnish: pulp, paper and board manufacturing! This old mill is like it has been stopped yesterday though it has been closed for over 50 years. You can hear and feel how pulp has been manufactured in old times. In modern mills you can't see it as concretically as you see it here - and those nice old stories!