23. Showbox at the Market
Address: 1426 1st Ave.
Coolest Feature: The Green Room lounge, where Nat King Cole performed back in the day
The Showbox was established in 1939, lasting through some of music's most polarizing periods. In its 74 years of existence, it has featured everyone from Duke Ellington to the Ramones to Kanye. Because it's located in Seattle, it played a crucial role in the Grunge era, helping to propel acts like Pearl Jam to stardom. Owned by AEG Live since 2007, the venue survived a '60s stint as a furniture showroom to become a huge contributor to the music scenes of both Seattle and the entire country.