How big are my lungs?

Ever since I learned that my lungs can hold 4.5 liters of air , I've been wondering how big they actually are. Lungs are normally the size of a rugby ball when fully in tacked, but if you were to take all the alveoli that makes up your lungs and laid them out side by side it would cover a tennis court.

wah?

 

The alveoli have a lot of surface area. That is incredible. The human body amazes me everyday.

All my info I got from here...