10. U Street Music Hall, Washington, D.C.
There are no dress codes, VIP areas or bottle service at D.C.'s underground outpost, and the seats are mostly bar stools: "U Street Music Hall is for dancing, not sitting," reminds their official website. Come here for cool DJs like Juan MacLean and Boys Noize, plus super-high-energy parties spotlighting the buzzy local sound known as moombahton.
Fun Fact: The club runs its own charity foundation, giving grants to nonprofits and music-education programs.