15 Strangest Holes On Earth

From terrifying home-swallowing sinkholes to picturesque natural caverns, we count fifteen awe-inspiring planetary cavities
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Image credits & information sources for this video:
Planet Dolan PTY LTD and Danger Dolan™ have made reasonable inquiries within the timeframe available to identify the source of any images used and attribute the source accordingly.

Background audio copyright Kevin MacLeod (incompetech.com)
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