Kaeng Krachan Racing Circuit in Thailand. Not a lot of people know about it, but for those who do, they’ll tell you that it’s one of the most amazing and difficult tracks in the world. Divided into three track layouts – the full-length track is 2.9 km long; the medium-length track is 2.39 km long; the short track is 1 km long – the Kaeng Krachan circuit is about two hours away from the country’s capital city of Bangkok, which isn’t all that far if you’re feeling the need to have a look at one of he world’s “best-kept secret” race tracks.