Ancient and medieval cities were built and surrounded by walls for protection. Some of these cities still exist with their barriers intact.
The Old Town of Dubrovnik, Croatia is surrounded by a wall designed to prevent a land or sea attack.
https://www.instagram.com/p/BjXzSW-HH9I/?tagged=oldtownofdubrovnik
In Carcassonne, France, there is evidence and rich history of each of the city’s occupiers, the Romans, Visigoths, and Crusaders.
https://www.instagram.com/p/BkXHjmOFDT-/?tagged=carcassonne
Taroudant, Morocco has not expanded beyond the walls that surround it. This is a vibrant market town.
Obidos, Portugal has been home to different empires, including Romans, Visigoths, and Moors. Each has lent a unique flavor to the architecture of the city.
York, England was first a Roman stronghold but was also occupied by the Normans. The remnants of their walls are combined with that built during medieval times.
https://www.instagram.com/p/BjlIyDjluF3/?tagged=yorkengland
Murten, Switzerland has the only remaining ring wall surrounding it in the whole country. You can walk around the city on it.
Essaouira, Morocco was occupied by the Berbers and the Carthaginians. However, its wall was only built in the 16th It is well-maintained and impressive.
Jerusalem, Israel has seen many walls built and destroyed. Some of their remnants are still visible. Its current wall was built in the 16th century.