Behold, the world's largest residential pool, which is located beside a 9,000-square-foot mansion in El Campo, Texas. Bowing to clients who wanted to create a "tropical getaway," pool designer Cheryl Kuykendall created an aquatic wonderland with a 40,000-square-foot main pool (filled with 750,000 gallons of water), six waterfalls, a 21-foot slide, a 500-foot lazy river, a bar, an outdoor kitchen, a kiddie area, and more. "The idea of this was to put so much into it that it was just an entire weekend of entertainment," Kuyendall explains of the project, which cost upwards of $3M.