I saw this posted on "Remember in Austin, Tx...when" on Facebook and thought it was interesting. These are the ruins of a small waterpark slide that existed in Southeast Austin. They're still there.
You can see it on Google Earth. They're located about 5,000 feet south of William Cannon Drive east of I-35.
It was called Aqua Thrill Way.
https://www.facebook.com/photo.php?f...type=1&theater
https://www.facebook.com/photo.php?f...type=1&theater
https://www.facebook.com/photo.php?f...type=1&theater