Istanbul City Walls (Self Guided), Istanbul

One of the most elaborate fortification systems of ancient times, the Walls of Constantinople were built by Constantine the Great to protect the city, the then newly-established capital of the Eastern Roman Empire, from attacks by land and sea. Of these, only the Golden Gate, an old ceremonial gateway into the city, had survived by the late Byzantine Era when a new series of land walls were added during the reign of Emperor Theodosius II, in the 5th century AD.

Thanks to their strategic position, these incredible fortifications saved Constantinople time and time again from the armies of foreign invaders that crashed against them in vain. To this date, the Istanbul City Walls, also known as the Theodosian Walls, have remained in various states of preservation – some almost intact, some crumbling, and some undergoing restoration. All of them, however, provide a vital link to the city's past and are free to wander around (preferably during daylight).

One of the prominent structures within the walls is the Xylokerkos Gate, also known as the Gate of Belgrade. Next to it, the Gate of Spring, or Pege Gate, provided access to a vital water source which was essential for the city's water supply, especially during times of siege.

The Gate of Rhesios was another critical point in the city's defense system. It controlled access to the city and helped in repelling invaders.

The Gate of Saint Romanus, named after a Byzantine saint, was a part of the elaborate fortifications that secured the city from various angles.

The Fifth Military Gate: While its name may not be as famous, this gate served a critical role in the overall defense strategy, allowing for the movement of troops and supplies.

The Gate of Charisius was one of the gates that reinforced the city's security and played a role in its long-lasting protection.

Having stood strong for centuries against numerous invasions, these ancient structures are more than just historical relics but a testament to the engineering prowess of the Byzantine Empire. Walking along these fortification marvels can transport you back in time and allow you to appreciate the invaluable heritage and culture of Istanbul.