Shinjyuku Golden Gai (Street) has some of the smallest bars in Japan but it is always packed with people.
https://www.tripadvisor.com/Attraction_Review-g1066457-d480651-Reviews-Shinjuku_Golden_Gai-Shinjuku_Tokyo_Tokyo_Prefecture_Kanto.html
https://en.wikipedia.org/wiki/Shinjuku_Golden_Gai