You can book a tour for €10 between mid June and the end of August at:

https://www.doerz.com/rauma/retki-sammallahdenmaelle?list_id=32

Tours occur only on Thursdays at 2pm from Rauma’s main bus station. If you have a car it is only 20km from Rauma and parking is free. Don’t go in winter as there will be nothing to see but snow.

I went in late July 2022 and there were a dozen of us plus the guide.  The guide spoke in both Finnish and English and was knowledgeable and passionate about his subject. The tour lasted almost one and three quarter hours and transportation was about 20 minutes each way.

Yes it’s a pile of rocks but they are a rather attractive pile of rocks. All three dozen cairns. Many were arranged into some discernible shapes and they present a rather colorful picture.

Originally a red brick hue to attract attention the stones have greyed over the years and are covered with various shades of black and white blotches. Original orange shows through on many as well as mottled spots of petrified green moss and white lichen.

The setting is in a lovely young green forest, carpeted with moss, white lichen and clumps of blooming lavender heather.  It’s an easy walk along a trail from one end of the site to the other.

I’ve been to other Unesco sites that are also just piles of rocks, but none as attractive or in as pretty a setting as this.