Long Bar is at Raffles Hotel. I was there on February, 2017 and there was renovation at the bar. But they had nice temporary bar to serve famous Singapore Sling.
It is the most famous drink in Singapore after Tiger, for sure. I read so many nice things before we went and I wanted to try. You can find singapore Sling in everywhere but this place is special because a barmen who used to work in Long Bar has been invented this drink. We have waited almost 30 minutes in the queue just to be able to get inside. And finally we ordered our slings. Price was shocking. We paid 40 Singapore dollar for one. But we were there anyways.
They give peanuts as a complimentary and you trash it to the floor. It is their aspects. Floor was full of peanuts.
If you want to taste original sling, I suggest you to go there. But it is a bit pricy please keep it your mind.
You can find more information about Long Bar here.