Hamilton Pool Preserve is a natural pool that was created when the dome of an underground river collapsed due to massive erosion thousands of years ago. The pool is located near Austin, Texas, United States. Found on: https://www.facebook.com/placestosee
Jacob's Well (Texas). Jacob's Well is a significant karstic spring, the largest perennial spring in the Texas Hill Country. The twelve foot (four meter) diameter mouth of the cave serves as a popular swimming and water recreation spot for the local land owners whose properties adjoin Cypress Creek.