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In this episode of The Atlas Obscura Podcast, we learn how scientists in Denver, Colorado, store and conduct tests on miles of ice core samples dating back hundreds of thousands of years.

Our podcast is an audio guide to the world’s wondrous, awe-inspiring, strange places. In under 15 minutes, we’ll take you to an incredible site, and along the way you’ll meet some fascinating people and hear their stories. Join us daily, Monday through Thursday, to explore a new wonder with cofounder Dylan Thuras and a neighborhood of Atlas Obscura reporters.

National Ice Core Lab.
National Ice Core Lab. Eric Cravens, Assistant Curator, National Ice Core Lab/Public Domain