Underground Metro

While using underground Metro
A thought occurred to my mind
Aren't we taking modern versions
Of ancient models of tunnels
For granted
Those tunnels connected states
Sometimes countries
These tunnels
Are more webbed
All over a city
And it is way too quick
Imagine the change
The mobility.
Time does change
But the models remain
Well! Modernity.
Or is it Post?
Wait till we too
Become ancient
And to reach a place
You disappear
Into a thin cloud.