|Geoffroy D' Aboville. c. 1927. Dover Press.|
The history of this region is complex, I am adding a bit from Wikipedia. But this small paragraph does not even begin to describe its ancient history, being part of the Ottoman Empire, and the occupation of Lebanon by Syria.
The poster is striking and looks "modern." It is a poster of ancient ruins in Palmyre, Syria. Nothing is known about the artist, Geoffroy D' Aboville, unfortunately, but this poster is all over the internet, and available for purchase.
"Lebanon-Syria Relations refer to the political, economic, and social relationships between the countries of Lebanon and Syria. Under the Ottoman Empire, Lebanon and Syria were included within the area of Greater Syria. Following World War I, the League of Nations Mandate partitioned Ottoman Greater Syria under French control, eventually leading to the creation of nation-states Lebanon and Syria. Relations between the two countries have been strained, especially with the 29-year Syrian Occupation of Lebanon."