Some of the World's Strangest Swimming Pools

Source:  popularmechanics.com

Where: Devils Pool, Victoria Falls, Zimbabwe, Southern Africa

This is probably the most scariest pool:
In the natural formation called Devil's Pool, swimmers can look over the falls in relative safety as thousands of gallons of water from the Zambezi River plunge 128 meters into the gorge. At the edge of the pool there is a rock wall that prevents the river from pulling swimmers over the edge.

Where:  San Alfonso Del Mar, Chile

The largest swimming pool in the world is more than 3000 feet long, with a deep end that descends 115 feet.

Where: Nemo 33, Brussels, Belgium

Formerly the world's deepest pool (until San Alfonso Del Mar stole that title in 2007), Nemo 33 remains the deepest indoor pool at 108 ft. Using highly filtered spring water at 96 degrees Fahrenheit.

Where:  The Library Blood-Red Pool,  Koh Samui, Thailand

The Library resort on the famous Koh Samui beach in Thailand is packed with dramatic scenery, but the blood-red pool stands out the most. The blood-red effect isn't from dyeing the water. The color comes from the combination of red, yellow and orange tiles from which the pool is made.

Where:  Pamukkale Pools, Turkey

The white terraces inside these pools are enough to take the first-time visitor's breath away. The bright white calcium and limestone deposits act like shelves buried in the water. Much like the Blue Lagoon in Iceland, the pools are praised for their healing powers because of the abundance of minerals in the water.

Where:  Bioluminescent Bay, Puerto Rico 

It's not exactly a pool, but it's too crazy to leave off the list. Bioluminescent Bay in Puerto Rico is the kind of phenomenon that could freak out any first-time visitor: When they swim in the bay, a trail of blue light follows swimmers wherever they go. It's not magic, but the abundance of single-cell organisms that give off this glowing color when they're agitated.