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Walk Behind a Waterfall

I did the walk behind the falls in niagara but it doesn't really count since ur in a tube behind a railing

Napali Coast Waterfall cave - Visit http://www.amazingplacesonearth.com/ for more good stuff :)

The 21 Most Magical Spots In Hawaii

The sea caves along the Na Pali Coast, Kauai, Hawaii. Specifically: Waiahuakua sea cave, Hoʻolulu sea cave and Open Ceiling cave