Rabati Castle built
900 CE.
Shown on the map at 41.643°, 42.978°.
Akhaltsikhe (Rabati) Castle (Georgian: ახალციხის (რაბათის) ციხე) is a medieval fortress built in the 9th century under the name "Lomsia Castle" in the city of Akhaltsikhe in southern Georgia, recently reconstructed. One of the main attractions of the Samtskhe-Javakheti region along with Vardzia.
Text from the Wikipedia article Akhaltsikhe Castle, licensed CC BY-SA 4.0.