Here are the some international lighthouse cancellations.

Ian Billings page of GB stamps and cancellations

Australia Lighthouse: Devonport	Azores Punta Delgada Lighthouse	Denmark Bascule light	Estonia Pakri Lighthouse	Estonia Pakri Lighthouse
Estonia Vaindloo Lighthouse	Estonia Ruknu Lighthouse	Estonia Kunda Lighthouse	Estonia Vilsandi Lighthouse	Korea
Yugoslavia	Aaland