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Jacob's Well, just outside of Austin. It is one of the longest underwater caves in Texas and an artesian spring. http://visitwimberley.com/jacobswell/index.shtml

Rock pools Canada Located halfway between Ucluelet and Port Alberni, the Rock Pools is a popular tourist attraction for people who want to cool their toes into its icy waters. During sizzling summer days, this place is perfect for sunbathing

Southern Livingfrom Southern Living

7. Kayak the Medina River - 16 Adventures in Texas' Hidden Hill Country

10 Adventures in Texas' Hidden Hill Country | 1. Kayak the Medina River | SouthernLiving.com

Hamilton Pool Nature Preserve (Dripping Springs, 37 miles on Highway 71 west of Austin, Texas)

Hawaiian Explorerfrom Hawaiian Explorer

Five Breathtaking Places in Hawaii You Didn’t Know Existed

Thermal Pool (free) 15 Things to Do Under 15 on Hawaii's Big Island Photos | Fodor's Travel Guides