Shinjuku is one of the 23 wards of the metropolis of Tokyo, but commonly refers to just the large entertainment, business and shopping area around Shinjuku Station.

Handling more than two million passengers each day, Shinjuku Station is Japan's busiest railway station, served by six railway companies and about a dozen railway and subway lines, including the JR Yamanote Line.

Shibuya is one of the twenty-three city wards of Tokyo, but often refers to just the popular shopping and entertainment area around Shibuya Station.

Shibuya is one of Tokyo's most colorful and busy districts and birthplace to many of Japan's fashion and entertainment trends. Most of the area's large department and fashion stores belong to either Tokyu or Seibu, two competing corporations.

A prominent landmark of Shibuya is the large intersection in front of the station (Hachiko Exit), which is heavily decorated by neon advertisements and giant video screens and gets crossed by amazingly large crowds of pedestrians each time the traffic light turns green.

Harajuku refers to the area around Tokyo's Harajuku Station, one station north of Shibuya on the Yamanote Line. It is the center of Japan's most extreme teenage cultures and fashion styles, but also offers shopping for grown-ups and some historic sights.

The focal point of Harajuku's teenage culture is Takenutsa Dori (Takenutsa Street) and its side streets, which are lined by many trendy shops, fashion boutiques, used clothes stores, crepe stands and fast food outlets geared towards the fashion and trend conscious teens.

In order to experience the teenage culture at its most extreme, visit Harajuku on a Sunday, when many young people gather around Harajuku Station and engage in cosplay ("costume play"), dressed up in crazy costumes to resemble anime characters, punk musicians, etc.

Daiba, literally meaning "fort", refers to some of the man made islands in the Bay of Tokyo, which were constructed in the end of the Edo Period (1603-1868) for the city's protection against attacks from the sea.

During the extravagant 1980s, a spectacular redevelopment of the islands into a futuristic business district was started, but development was critically slowed down after the burst of the "bubble economy" in the early 1990s.

It was not until the second half of the 1990s, that Odaiba developed into one of Tokyo's most interesting tourist spots and the highly popular shopping and entertainment district, which it is today. Further development of the area is still underway.