Here's neat image from Wikipedia:
On the right there's a tall white tower with a rounded tank on top looking much like a water tower. There's another one right behind the first one opposing the other spaceship.
What's that tower and what is it for?
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2possible duplicate of What is the purpose of the jets of water often under rocket engines during launch? – Deer Hunter Feb 16 '15 at 08:02
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1Here's an illustration of the use of water (from water towers) during the launch of a Saturn V (from 4:00 minutes into it): https://www.youtube.com/watch?v=vPW7ZqtW5U4 – LocalFluff Feb 16 '15 at 10:09
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It's clearly a War of the Worlds alien in disguise... – smci Feb 16 '15 at 23:57
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This tower is 290 ft. high. It has storage capacity of 300000 gallons of water used during STS launches to protect the Orbiter and its payload from acoustic vibrations due to SRB's firing. The pipes beneath the tower are the main distribution area.
For more information, including a virtual walkaround, please visit http://nasatech.net/ntSubPad39A_PAGE.html, in particular this view.
Deer Hunter
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Here is extended high speed camera footage of space shuttle launches showing all the water cooling going on. In it, they specifically point out these towers and their purpose (as stated in the answer). – Feb 05 '16 at 13:28