Earlier this month, I spent a little over a week exploring one of the biggest mysteries in then Cascade Range. It’s a string of volcanoes spanning from Northern California into British Columbia and host to such well-known peaks as Mount St. Helens, Hood and Shasta. Yet, some of the largest eruptions over the past million years in the Cascades may have come from volcanoes that are totally hidden from view today. One of those mystery volcanoes is the Tumalo Volcanic Center.