This cache is here to let you know about Adventure labs. I have placed one called "Historic Grass Valley". Visit its 5 locations, learn some history and a gain a find for each one.
You can play it from the geocaching Adventure Lab app using your iPhone, iPad or Android device. If you have not already installed the new version of the Adventure Lab app, you'll need do so from https://labs.geocaching.com/ Then log into that app using your existing Geocaching username and password. Once you scroll past the intro pages, you should see the Historic Grass Valley Adventure - start of it is nearby.
Answer a question at each Adventure Lab location to get a find, similar to finding a Virtual cache, except you do it all on your iPhone, iPad or Android device. The Lab finds count towards your final find statistics, too. So find the Traditional cache here, and while you are in Grass Valley, find the 5 labs nearby!
You can also visit nearby Nevada City and explore the Historic Nevada City Adventure Lab and learn more about California's gold rush and mining era.
Thank you magpup for releasing your location for this cache.