National Geographic Investigates

The life of drug kingpin El Chapo Guzmn.

For years psychedelics were forced into the shadows in a de facto prohibition. But today we're learning just how much they can help heal modern ills.

Hippos are invading Colombia, thanks to Pablo Escobar. The government must act, but it's complicated. What will be the fate of these giant invaders?

The US war on pot is not over; penalties and jailtime are still a threat.