Sushi Dai (寿司大) is a very very popular sushi restaurant in Tsukiji Fish Market. You probably have heard the name in many guide books before. This place is not only famous among foreigners, but among locals as well.
Kowloon Walled City was an ungoverned settlement in New Kowloon, Hong Kong. The city was famous for its criminal activities that even the police couldn't do anything about it. The city was controlled by Triads and had high rates of prostitution, gambling, and drug use. The city was demolished in April 1994. Despite of that, its famous still persists in literature, video games, and movies.
While the city no longer exists, you can experience a little bit of the city, in Japan, in a place called Digital Kowloon Walled City.