This internationally known red-light district is a favorite night hangout for many foreigners. The true heart of Thai sex industry is supposedly where the Go-Go culture started. The bars are located on two parallel streets surrounded by a night market.
Beware of bars with sex shows - these are often overpriced and you are very likely to get ripped off. Also, avoid guys inviting you for a ping pong show - they like to scam tourists as well.
Wikipedia https://en.wikipedia.org/wiki/Patpong
Address Thailand
Coordinates 13°43'41.999" N 100°31'59.999" E