List of cities with defensive walls - Wikipedia
PDF) Traces of Seismic Activity in Architectural Monuments in Derbent, Dagestan
fortress Day by Day Correspondence
Experts busy demarcating great defensive wall as a prerequisite for UNESCO status - Tehran Times
The Caspian Gates: History the Caucasus's Great Wall
Category:City walls - Wikimedia Commons
A. OVSYUCHENKO, Russian Academy of Sciences, Moscow, RAS, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
Juma Mosque in the city of Derbent, where the traces of strong
The Caspian Gates: History the Caucasus's Great Wall
The Caspian Gates: History the Caucasus's Great Wall
List of cities with defensive walls - Wikipedia
Andrey KORZHENKOV, Head of Laboratory of Paleoseismology and Paleogeodynamics, Dr. Habil. in Geology, Russian Academy of Sciences, Moscow, RAS
PDF) The Northern Fortress and the Myth of Iron Gate
