Wheal Coates is an old Cornish tin mine that shut down in 1914. Like all mines in Cornwall, what you can see is very much the tip of the iceberg — these buildings only housed the pumps for keeping the mine shafts dry. In some mines the shafts would go half a mile down and up to a mile out to sea.
Fujifilm X-T1 with XF 18-55 F2.8-4 lens at 18mm, 1/350s, f/11, and ISO800.