<p>If I remember correctly,</p>

<blockquote class="spoiler">
  <p> the walls were built with the hardening ability of Titans.</p>
</blockquote>

<p>As a result, the walls are very tough to break and have sheltered human kinds for decades.</p>

CC BY-SA 3.0
2015-01-07T14:47:04.683Z
but titans evaporate and for those walls to happen they must have killed millions of titans..
Esqarrouth
CC BY-SA 3.0
2015-03-13T02:50:02.110Z
@Esq actualy titan flesh from titans with the hardening power do not evaporate.
Mindwin Remember Monica
CC BY-SA 4.0
2014-02-18T11:45:39.810Z
2020-02-12T23:23:24.947Z
2020-02-12T23:23:24.947Z
SeasonalShot
<p>Just adding on the rest of the answers here, but</p>

<blockquote class="spoiler">
  <p> "the walls were built with the exoskeletons of titans"</p>
</blockquote>

<p>seems to be somewhat different on the <a href="http://shingekinokyojin.wikia.com/wiki/Wall_Titan">Shingeki no Kyojin Wikia</a>:</p>

<blockquote class="spoiler">
  <p> The Wall Titans (幻の巨人 Maboroshi no Kyojin?, Phantom Titans) are unusual kind of Titans that make up the Walls that protect humanity. They are first revealed when the Female Titan tried to climb Wall Sina to escape from Eren and the Survey Corps. The lack of sunlight inside the Walls renders them immobile. <br/> <br/> It is implied that the Wall Titans have the ability of using their crystallizing powers to create massive walls, notably Wall Maria, Rose and Sina. Their exact motives for doing this are unknown.</p>
</blockquote>

<p>This seems to imply something completely different to what I was thinking. Of course you can't trust everything you read, but I like to think this information is pretty accurate.</p>

CC BY-SA 3.0
2014-05-31T11:32:29.413Z
2014-11-05T20:48:27.063Z
2014-11-05T20:48:27.063Z
Izumi-reiLuLu
<p>The walls are built by a special breed of titans that the colossal titan is and this is discovered when a piece of the wall is broken off
<img src="https://i.sstatic.net/XX6Xz.png" alt="enter image description here"></p>

<p>It is also stated <a href="http://shingekinokyojin.wikia.com/wiki/Wall_Cult" rel="nofollow noreferrer">here</a> that a group of religious fanatics and the king know about the wall being made of titans.</p>

<p>Though the reason for the wall titans to protect humans is not stated it is possible that titan shifters made up the wall it is also possible that not all titans are against humanity considering the size of these titans they could have preyed on other titans thus providing a motive they wished to prey on titans and humans attract titans the humans might have trapped them and then the titans went into hibernation</p>

CC BY-SA 3.0
2015-09-03T16:20:59.230Z
What episode does this shot comes from? I don't quite recall that scene...
hc0re
CC BY-SA 3.0
2014-12-25T06:40:08.310Z
2014-12-25T09:36:50.000Z
2014-12-25T09:36:50.000Z
Rohan
<p>The walls weren't exactly built by humans.</p>

<blockquote class="spoiler">
  <p> The walls are all made from 50 meter colossal titans. They are unable to move because it is dark inside the walls and they become immobile in the dark.</p>
</blockquote>

<p>This is shown in the final episode of the anime after the credits.</p>

CC BY-SA 3.0
2014-05-17T04:54:22.187Z
2014-11-05T20:49:26.923Z
2014-11-05T20:49:26.923Z
Brandon159
<p>Rod Reiss' ancestors, the first king, used his powers to create the walls (and Titans?) And wiped all memory of the word before the walls from the mind of humanity.</p>

CC BY-SA 3.0
2015-03-13T02:51:45.310Z
This is disclosed on chapters sixty-something.
Mindwin Remember Monica
CC BY-SA 3.0
2015-02-20T01:38:04.133Z
Welcome to Anime and Manga. could you provide a source to this (ie. manga/novel chapter no. urls to web pages)
Memor-X
CC BY-SA 3.0
2015-02-20T01:31:30.537Z
2015-02-20T01:31:30.537Z
john Steitz
<h2>Spoilers from the manga.</h2>

<p>After the king's sanctum incident (ch50~65) </p>

<blockquote class="spoiler">
  <p> (when Rod Reiss tried to make Historia eat Eren), </p>
</blockquote>

<p>it is disclosed that</p>

<blockquote class="spoiler">
  <p> The First King used his Coordinate power (control over titans) to force those titans to use their hardening power to shape up the walls, then used his Memory power to wipe the memories from the pre-wall era from humanity. </p>
</blockquote>

<p>Why did he </p>

<blockquote class="spoiler">
  <p> leave hibernating titans inside the walls</p>
</blockquote>

<p>is unknown.</p>

<blockquote class="spoiler">
  <p> he also created the Wallist Church to help him oversee the walls safety.</p>
</blockquote>

CC BY-SA 3.0
2015-03-13T11:24:08.700Z
^ This should be at the top.
Peter Raeves
CC BY-SA 3.0
2015-03-13T02:57:07.603Z
2015-08-06T19:41:41.070Z
2015-08-06T19:41:41.070Z
Mindwin Remember Monica
<p>If I remember correctly, in Attack on Titan, it's mentioned or implied a number of times that humans built the walls to protect themselves from the titans. (Feel free to correct me if I'm wrong on this.) If so then, how did they manage to get the walls erected (which seem to be the result of somewhat extensive work) without getting killed, if they were already under attack by that point?</p>

<p>(Note: I'm only about halfway through the anime series, so I might just be missing something that appears later.)</p>

CC BY-SA 3.0
2014-02-18T15:12:40.453Z
just the way humans built bridges and huge building in todays time :P
votelessbubble
CC BY-SA 3.0
2014-02-19T03:11:44.617Z
@hungerartist its just a joke, i obviously didn't mean it :S
votelessbubble
<attack-on-titan>
How were the walls in Attack on Titan built?
# How were the walls in Attack on Titan built?
Posted by: username_0 on 2014-02-18
If I remember correctly, in Attack on Titan, it's mentioned or implied a number of times that humans built the walls to protect themselves from the titans. (Feel free to correct me if I'm wrong on this.) If so then, how did they manage to get the walls erected (which seem to be the result of somewhat extensive work) without getting killed, if they were already under attack by that point?

(Note: I'm only about halfway through the anime series, so I might just be missing something that appears later.)
**Tags:** attack-on-titan
> **Comments:**
> **username_1**: just the way humans built bridges and huge building in todays time :P  
> **username_1**: @hungerartist its just a joke, i obviously didn't mean it :S  
---
## 6 answers
### Answer by username_4 on 2015-03-13. Score: 16 | Accepted answer
## Spoilers from the manga.

After the king's sanctum incident (ch50~65)

> (when Rod Reiss tried to make Historia eat Eren),

it is disclosed that

> The First King used his Coordinate power (control over titans) to force those titans to use their hardening power to shape up the walls, then used his Memory power to wipe the memories from the pre-wall era from humanity.

Why did he

> leave hibernating titans inside the walls

is unknown.

> he also created the Wallist Church to help him oversee the walls safety.
> **Comments:**
> **username_11** (2015-03-13): ^ This should be at the top.  
---
### Answer by username_2 on 2014-02-18. Score: 10
If I remember correctly,

> the walls were built with the hardening ability of Titans.

As a result, the walls are very tough to break and have sheltered human kinds for decades.
> **Comments:**
> **username_3** (2015-01-07): but titans evaporate and for those walls to happen they must have killed millions of titans..  
> **username_4** (2015-03-13): @Esq actualy titan flesh from titans with the hardening power do not evaporate.  
---
### Answer by username_5 on 2014-05-31. Score: 9
Just adding on the rest of the answers here, but

> "the walls were built with the exoskeletons of titans"

seems to be somewhat different on the [Shingeki no Kyojin Wikia](http://shingekinokyojin.wikia.com/wiki/Wall_Titan):

> The Wall Titans (幻の巨人 Maboroshi no Kyojin?, Phantom Titans) are unusual kind of Titans that make up the Walls that protect humanity. They are first revealed when the Female Titan tried to climb Wall Sina to escape from Eren and the Survey Corps. The lack of sunlight inside the Walls renders them immobile.   
>    
>  It is implied that the Wall Titans have the ability of using their crystallizing powers to create massive walls, notably Wall Maria, Rose and Sina. Their exact motives for doing this are unknown.

This seems to imply something completely different to what I was thinking. Of course you can't trust everything you read, but I like to think this information is pretty accurate.
---
### Answer by username_6 on 2014-12-25. Score: 5
The walls are built by a special breed of titans that the colossal titan is and this is discovered when a piece of the wall is broken off
![enter image description here](https://i.sstatic.net/XX6Xz.png)

It is also stated [here](http://shingekinokyojin.wikia.com/wiki/Wall_Cult) that a group of religious fanatics and the king know about the wall being made of titans.

Though the reason for the wall titans to protect humans is not stated it is possible that titan shifters made up the wall it is also possible that not all titans are against humanity considering the size of these titans they could have preyed on other titans thus providing a motive they wished to prey on titans and humans attract titans the humans might have trapped them and then the titans went into hibernation
> **Comments:**
> **username_7** (2015-09-03): What episode does this shot comes from? I don't quite recall that scene...  
---
### Answer by username_8 on 2014-05-17. Score: 4
The walls weren't exactly built by humans.

> The walls are all made from 50 meter colossal titans. They are unable to move because it is dark inside the walls and they become immobile in the dark.

This is shown in the final episode of the anime after the credits.
---
### Answer by username_9 on 2015-02-20. Score: 1
Rod Reiss' ancestors, the first king, used his powers to create the walls (and Titans?) And wiped all memory of the word before the walls from the mind of humanity.
> **Comments:**
> **username_10** (2015-02-20): Welcome to Anime and Manga. could you provide a source to this (ie. manga/novel chapter no. urls to web pages)  
> **username_4** (2015-03-13): This is disclosed on chapters sixty-something.  
---
