Gwynedd: See
There are a number of prehistoric monuments in the northern part of the county and in southern portion as well as Roman to Modern sites to visit in Gwynedd. Prehistoric sites include hill forts, standing stones, cairns and hut circles.
Large-scale slate mining was important to Wales's economy between the late-18th and mid-20th centuries, and there are many relics of this industry to be found all over Gwynedd, from the remains of quarries, to the railways used to transport the slate to waiting ships at the coast, to workers' housing and amenities. This treasure was made a UNESCO World Heritage Site in 2021.