Browsing the old Irish 1st series 6-inch maps around Lough Foyle came across "Corn Kiln" in the middle of Greencastle (Donegal). Looked interesting: turns out they were universal in Ireland and much of Scotland. Not sure how many are left but County Meath document 5 examples: http://www.meathheritage.com/index.php/archives/cat/kiln-corn-drying.