A house is built over renovated wall of Constantinople (modern Istanbul)

A house is built over renovated wall of Constantinople (modern Istanbul)

Here part of the old and crumbling wall can be seen. This section of the wall is close to the Sea of Marmara

Here part of the old and crumbling wall can be seen. This section of the wall is close to the Sea of Marmara

Frames of the old doors inside the wall - Greeks built the first walls, Roman emperor Septimius Severus built the second one

Frames of the old doors inside the wall - Greeks built the first walls, Roman emperor Septimius Severus built the second one

Entry door in a renovated wall of Istanbul -  Constantine the Great expanded the city to the west and thus built the walls, the final walls are called Theodosian

Entry door in a renovated wall of Istanbul - Constantine the Great expanded the city to the west and thus built the walls, the final walls are called Theodosian

Theodosian Walls with a broken tower - These walls were built in 412-414

Theodosian Walls with a broken tower - These walls were built in 412-414

The area next to the walls were occupied by homeless people

The area next to the walls were occupied by homeless people

A park next to the wall where Panorama 1453 History Museum is located

A park next to the wall where Panorama 1453 History Museum is located

Here double walls of Constantinople can be seen

Here double walls of Constantinople can be seen

The capture of Rome by the Visigoths in 410  that forced the Byzantine government to build a fourth wall

The capture of Rome by the Visigoths in 410 that forced the Byzantine government to build a fourth wall

This guy was sitting next to the wall and looking at a torn page from an adult magazine

This guy was sitting next to the wall and looking at a torn page from an adult magazine

These walls surrounded an area of 12 km, was 12 m high, and had 96 towers that were about 18 m tall

These walls surrounded an area of 12 km, was 12 m high, and had 96 towers that were about 18 m tall

Ruins of the old wall

Ruins of the old wall

Remains of an old lookout tower

Remains of an old lookout tower

A renovated tower of the old wall

A renovated tower of the old wall

Theodosian Walls of Istanbul - this section of the walls is close to the Golden Horn

Theodosian Walls of Istanbul - this section of the walls is close to the Golden Horn

In 447, the walls were partly destroyed by an earthquake but more towers added to increase the defensive strength

In 447, the walls were partly destroyed by an earthquake but more towers added to increase the defensive strength

Rows of defensive towers, there were 192 of them at one stage

Rows of defensive towers, there were 192 of them at one stage

A tower with a Turkish flag on it - here road is built through the city walls

A tower with a Turkish flag on it - here road is built through the city walls

City walls next to the Edirne kapi (Edirne Gate)

City walls next to the Edirne kapi (Edirne Gate)

The Gate of Charisius is named after a monastery founded here. In Turkish it is known as Edirnekapi (

The Gate of Charisius is named after a monastery founded here. In Turkish it is known as Edirnekapi ("Adrianople Gate")

It is here where Mehmed II(Fateh Sultan) made his triumphal entry into the conquered city

It is here where Mehmed II(Fateh Sultan) made his triumphal entry into the conquered city

The walled up Fourth Military Gate of Istanbul. This gate stands between towers 59 and 60.

The walled up Fourth Military Gate of Istanbul. This gate stands between towers 59 and 60.

Close up of the Fourth Gate - it has been suggested that this gate is actually the Gate of St. Romanus

Close up of the Fourth Gate - it has been suggested that this gate is actually the Gate of St. Romanus

Old and renovated walls next to eachother

Old and renovated walls next to eachother

This lone fragment is making a last stand against the elements

This lone fragment is making a last stand against the elements

A big chunk of wall is lying on floor next to a very busy road

A big chunk of wall is lying on floor next to a very busy road

Wall next to Adnan Menderes Blvd. - Istanbul

Wall next to Adnan Menderes Blvd. - Istanbul

Renovated walls of Istanbul

Renovated walls of Istanbul

This tower is splitting in the middle but it still reminds us about the strength of these walls

This tower is splitting in the middle but it still reminds us about the strength of these walls

Cars coming out of a small door in the city walls. Access is managed by a traffic light

Cars coming out of a small door in the city walls. Access is managed by a traffic light

A big Cannon was used to bombard this part of the wall

A big Cannon was used to bombard this part of the wall

Wall was hastily built by Byzantins to keep the invading army out of the city

Wall was hastily built by Byzantins to keep the invading army out of the city

Topkapi gate & a tower

Topkapi gate & a tower

Wall - next to the Topkapi (the Cannon Gate)

Wall - next to the Topkapi (the Cannon Gate)

There are stills marks of bombardment on the wall which were left by the giant cannon of Orban

There are stills marks of bombardment on the wall which were left by the giant cannon of Orban

It was the biggest cannon ever built and for the first time Constantinople's defence was breached

It was the biggest cannon ever built and for the first time Constantinople's defence was breached

Top of the the Topkapi - seen from outside. It is here that Constantine XI Palaiologos, the last Byzantine emperor, was killed on 29 May 1453

Top of the the Topkapi - seen from outside. It is here that Constantine XI Palaiologos, the last Byzantine emperor, was killed on 29 May 1453

City wall next to the Topkapi area

City wall next to the Topkapi area

Wall stretching towards the Edirnekapi

Wall stretching towards the Edirnekapi

A renovated tower above the old wall

A renovated tower above the old wall

It is also called the Gate of St. Romanus - seen from inside

It is also called the Gate of St. Romanus - seen from inside