Human Towers
- Episode aired Jan 7, 2019
![Phil Keoghan in Explorer (2015)](https://m.media-amazon.com/images/M/MV5BNTI4YWM2NTctNjUxYi00NmQxLTg3N2MtNmQ2ZGExOTEwOWUyXkEyXkFqcGdeQXVyNjAzNzA0ODE@._V1_QL75_UX190_CR0,0,190,281_.jpg)
Castellers, also known as human towers; grizzly bears; security for marijuana businesses; the color blue.Castellers, also known as human towers; grizzly bears; security for marijuana businesses; the color blue.Castellers, also known as human towers; grizzly bears; security for marijuana businesses; the color blue.