Where am I?

It won't take long to crumble,
If you leave me all alone!
Because my walls are made of slate,
Not modern brick and stone!

I need you to rebuild me,
Yet somehow save my soul!
Redeem my special features,
And leave me feeling whole!

Make good my inner beauty,
For all the world to see!
Tell them who I am today,
So they all know that it's me!

Come to me, heal me,
And I'll be your beating heart!
You'll see I'm somewhere special,
A place where rebirth has a start!

If you decide to leave me,
Wait for someone else to act!
Then you've missed an opportunity,
To unite and make a pact!