The Giant Crystal Cave is a cave connected to the Naica Mine in Mexico with massive crystals. The average person can only stay inside for ten minutes because there is 99% humidity, whoa! For this challenge, grow your own crystals at home with Epsom salts, food coloring, and a bowl. Turn off the air conditioning if you want to enhance the cave simulation, haha! Skip to 5:23 in the video below to learn more.