I seem to be on a swimming pool theme… I just read about the biggest pool in the world. It is a saltwater pool in Chile that is truly monumental:

• Almost 1km long
• 35m deep at the deep end
• It took 5 years to build
• Building cost was almost $2 billion and maintenance is about $4million per year!
• The filtered and recycled seawater is so clear that you can see the bottom, even at the deep end

It is pretty amazing. Here is a link to a short report on the pool.