PERU: La Rinconada is the highest city in the world. It is over three miles high (16,732 feet). It is also on top of a gold mine! For more details, check out this link HERE.
In class, students made their own tiny pieces of gold, while others tried to build a tower to the ceiling to represent “the highest city in the world”. You could definitely go more in depth here on the topic of mining with older students.