The flush: Bar 89, New York City

The lowdown: Most New Yorkers know about this Soho bar and restaurant, but it should be on everyone's must-pee list. From the outside, the stalls are clear glass, yet when you go in and lock the door, some wildly misused technical wizardry causes the glass to frost over so people can't see you inside. Do you really trust science this much? Do you want to be the poor schmuck caught on YouTube peering out anxiously as a crowd gathers? Well, the technology hasn't failed after all these years, though you may want to take a magazine to hide behind just in case. Phoenix designer Janis Leonard is responsible. She also designed the bar's huge, curving skylight, though everyone's pretty much here for the bathrooms on the mezzanine level. Our advice? Skip dinner, order a couple of cocktails at the bar, and then head to the loo. Just remember to lock the door.

If you have to go:
Bar 89
Tel: 212 274 0989