I’ve never visited Lake Arrowhead in Southern California, but this is still one of my favorite episodes of California’s Gold. Maybe it’s because of the complicated history of the lake’s construction; or because I’m fascinated by the old tunnels that lead under Lake Arrowhead itself. Or maybe it’s because Huell has so much fun riding in an 80-year-old elevator and seeing the heavy equipment left to rust in the silent darkness. For a little extra added entertainment, you might try counting how many times during the episode Huell says, “Oh, my gosh!”

Originally built as a reservoir to feed the citrus groves of San Bernardino through a series of flumes and tunnels, this engineering marvel fell apart. For legal reasons, the project never worked and the reservoir became a recreational area. What most people don’t know is that there is a whole world under the lake.

(Click on the linked image below to see the video.)