Host Mo Rocca shows us the man making mansions in the trees; the innovator turning your smart phone into an underwater camera; making Mexico's highways greener with vertical gardens; and, when the railroad world ditched steam for diesel.

Host Mo Rocca shows us the London innovator creating artistic globes of the world; the woman who took her grandmother's tea recipe to make food last longer; the drone finding and clearing landmines from war-torn countries; and, the place where modern-day technology began.