From the exterior, Orchid looks like just another historical building in Koreatown. But inside it feels like a Vegas club, with stainless steel waterwalls, coral-like pillars, lighted towers that change color—and ultra-private rooms for, ahem, karaoke.

The 18 luxurious rooms upstairs are equipped with multiple flat-screen televisions, surround-sound equipment and an expansive music video library in English, Korean, Chinese, Indonesian, Tagalog and Japanese. Renting your own room means you bring your audience with you. There's a "butler button" to order food and drinks (including more than 100 martinis to choose from) without getting interrupted. —Alexandra Le Tellier