Potosi

Potosí is the capital city and a municipality of the Department of Potosí in Bolivia. It was known as Villa Imperial de Potosí in the colonial period, a nickname related to its fame at that time as a major silver-producing center.

The common Spanish expression "vale un Potosí" means "to be worth a Potosi" and is used to describe something of great value. It's not a common English saying and amounts to obscure trivia I learned on a snooty self-important classist forum that treated me terribly while I was there.

The city sits at a nominal 4,067 m (13,343 ft) making it one of the highest cities in the world. That's a little over 2.5 miles high if you want to compare it to the detail of height that makes Denver, Colorado famous. 

Diego Huallpa was an indigenous prospector and the English language Wikipedia article about Potosi says he is traditionally credited with the discovery of the Cerro Rico in 1545, which led to the founding and rapid growth of Potosí due to its extraordinary silver wealth. It provides a place keeper for a nonexistent English article about him and also points to a Spanish language Wikipedia article about him.