Keselo is a small medieval fortress just above the village of Omalo. The site is surrounded by the northern slopes of the Greater Caucasus Mountains. It is bordered in the north by Republic of Chechnya and Dagestan, in the east by the Georgian historic provinces Kakheti and Pshav-Khevsureti to the south.
Traditionally Tush peoples abandoned their villages and used towers as temporary shelters during raids on their villages. Keselo was constructed during the Mongol invasion of Georgia in 1230s. It originally had 13 towers. The inhabitants of old Omalo used the towers to protect themselves from the invading Mongols and later raids by Daghestani tribes.
By the 20th century, most of the towers were in ruins. However, in 2003, work began to rebuild five towers of the medieval fortress. The project was privately sponsored by Henk and Eliane Hooft, a Dutch family living in Georgia and later by the Keselo Foundation. The restoration was done in accordance with the medieval Tush techniques of constructing fortified towers. A monument was also erected in the nearby village of Dartlo and a tower in Khiso, on the road to Omalo, was also rebuilt. During the work, an array of archaeological artefacts, such as ancient rock art motifs and Bronze Age axes and jewellery, were discovered.
References:The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.