Where do uninitialized Global Variables go after initializing?

I struck a little problem when learning. I know that uninitialized global variables in C are assigned to the .bss section in the executable ELF file. But what happens to them when I start to use them? I.e. do they get a place on the heap or somewhere else? I tried to find out by printing the address of the (still uninitialized) global variable with printf("%x",&glbl); which always return the same value 0x80495bc... Why?
I've noticed that you accepted an answer 5 minutes after asking the question. You'll get more answers if you leave it open for some time as people will be more motivated to improve on the answers.

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