In this reel, we're venturing deep, deep underground. We begin in Stockholm at the world's longest art gallery, explore the mysteries of shell grotto, and visit the hidden metropolis 150 feet beneath Kansas City.
This story is a part of our Planet Earth series. From mammals to insects and birds to reptiles, we share this great big world with all manner of creatures, large and small. Come with us to faraway places as we explore our great big planet and meet some of its wildest inhabitants.
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