Can you train effectively WITHOUT a gym?

So can you?  Is it possible to make progress without having an endless membership to the regular commercial, machine laden gym?

How to build the GREATEST LEGS of all time!

I like Tyson Chandler.  Great defender and teammate.  BUT, these legs...how much better could he be if he squatted???

Legs.  A woman's favorite muscle group to train and a man's most ignored muscle group.