Paul Dobbins visited The Kelp House in Northern Ireland. In the 1800‘s, The Kelp House on Rathlin Island off of Northern Ireland was used to store processed kelp before it was exported. Kelp was collected and put into stone kilns and burned until it turned into a "boiling mass”. From this the Islanders produced soda and iodine. The Kelp House is now owned by the National Trust.
Source: Ocean Approved’s Facebook page