Scent of Home

On a walk through my parents' old neighborhood in Lexington, where I sniff deeply of the mown grass to see if I can detect the scent of home. 

It's there, I know it is, though I can't put my finger on exactly what's different. 

Is it the bluegrass, full of calcium from the limestone-rich soil? 

Is it the way the light strikes the lawns and releases an aroma?

Or is it knowing that the bones of my ancestors lie in cemeteries just miles away?