stealth detection from structures

[corbet]

I was on dota2 wiki a while back and thought i saw something regarding this. since then i have not been able to find any thing on dota2 wiki about it. i went to invisibility page, aswell as the info about structures. maybe i missed it second time around.

my question is what structures provide stealth detection, and is there any that do not provide stealth detection such as barracks or the other buildings that act as buffers to minions around the fountain area. and the range of the this stealth detection, i just want all info regarding this.

[LadyClipton Ice Tii]

Best way to learn is recognise the little places on the map that you will be seen/attacked by a tower. You should probably do that on the map in a bots game or something.

The only buildings that provide true sight are:
-Towers
-Ancient
-Fountain

I'm pretty sure towers have a range of 600 - 700. Don't quote me on that though, it's my estimated guess.

Evidence: Sniper gains the ability to 'outrange' towers at level 3 in 'Take Aim'. Which gives him +300 range compared to +200 range on level 2, with his base range of 550.

Correct me if I'm wrong :C

[LadyClipton Ice Tii]

Now I'm really confused, this is the Dota 2 Wiki link anyway:
http://dota2.gamepedia.com/Tower#Towers

[Frenge]

Towers and Ancients have True Sight in a 900 radius, while the Fountains have 1200 True Sight radius.