Full spa experience by anjel c. at InsiderPages
This place allows you to stay as long as you like for a flat fee of like $20. They do full body scrubs, they have sauna rooms, they have hot floor cold floor, bars you can hang from and let gravity release you. And its all very new and clean.
Read more at atlanta.citysearch.com
The other cool thing is they're open 24hrs.
PROS: always open, lots of options
CONS: people are nude