Thurant Castle (Burg Thurant) was built in 1198-1206 by Heinrich Pfalgraf Guelphs. It was besieged in 1246-1248 during the war between Trier and Cologne archbishops. After the war the castle was interestingly divided to two parts, Trier tower and Cologne Tower. Both sides had a separate entrance and living buildings. In the 19th century the castle was left to decay, but restored in the 20th century.References:
Narikala is an ancient fortress overlooking Tbilisi, the capital of Georgia, and the Kura River. The fortress consists of two walled sections on a steep hill between the sulphur baths and the botanical gardens of Tbilisi. On the lower court there is the recently restored St Nicholas church. Newly built in 1996–1997, it replaces the original 13th-century church that was destroyed in a fire. The new church is of 'prescribed cross' type, having doors on three sides. The internal part of the church is decorated with the frescos showing scenes both from the Bible and history of Georgia.
The fortress was established in the 4th century and it was a Persian citadel. It was considerably expanded by the Umayyads in the 7th century and later, by king David the Builder (1089–1125). Most of extant fortifications date from the 16th and 17th centuries. In 1827, parts of the fortress were damaged by an earthquake and demolished.