This stamp was issued by LibanPost on 3 Dec 2016 and depicts the Old Beirut Lighthouse, known as Ra’s Bayrut L/H. This light was deactivated in 2003 when the construction of a new building obscured it. The owners of the new building replaced it with a new lighthouse in the same year that the previous one was deactivated.
Old Beirut (R'as Bayrut) L/H | 3 Dec 2016 - Image source: Universal Postal UnionA complete listing of Lebanon’s lighthouse stamps can be found here