This is played four times.
E|--------------------------------| 
B|--------------------------------| 
G|--------------------------------| 
D|-------4----4----4-/6------4----| 
A|-----4---------4------2-4h------| 
E|---2------2--2------------------| 


For this second part of the intro I'm pretty sure it's Gb sus2:

E|-------| 
B|-------| 
G|---13--| 
D|---11--| 
A|---9---| 
E|-------| 

When strumming up and down, alternate muting the A and 
G string.
Might look a bit like this:

E|-------------------------------------------| 
B|-------------------------------------------| 
G|----x----13-----x----13-----x----13-----x--| 
D|---11----11----11----11----11----11----11--| 
A|---9------x-----9-----x-----9-----9-----9--| 
E|-------------------------------------------| 


[Verse]

The chords during the verse are Db5, Gb5, Db, Gb, Ab5, 
and Gb5, respectively. The strumming pattern is
similar to that of the second part of the intro. Maybe 
use the tremolo bar on the last chord.
This part is played twice:

E|------------------------------------------| 
B|------------------------------------------| 
G|---13-----18-----10-----15-----7------4---| 
D|---11-----16-----11-----16-----6------6---| 
A|------------------------------------------| 
E|------------------------------------------| 

[Bridge]

This is the bit where the lyrics are:

Behind the walls
It goes on for miles
...

The two sections below are played twice.
The first chord is played with tremolo bar:

E|--------N-----------| 
B|----x---N---11------| 
G|---11---N---11------| 
D|----9---N----9------| 
A|--------N-----------| 
E|--------N-----------| 


E|--------------------| 
B|--------------------| 
G|---4------10--------| 
D|---6-------8--------| 
A|--------------------| 
E|--------------------| 

[Pre-verse,I guess]

This is played before repeating the second part of the 
intro and verse.
Tremolo bar is used on the last chord:

E|-----------------------------N--| 
B|---11-------9-----14---------N--| 
G|---11------11-----13-----11--N--| 
D|-------------------------11--N--| 
A|-------------------------13--N--| 
E|-----------------------------N--| 

Then it repeats, beginning at the second part of the 
intro.

************************************

| /  Slide up
| h  Hammer-on
| x  Dead note