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Photo: Wiiii, CC BY-SA 3.0 via Wikimedia Commons
Historic red-brick building near the waterfront in Yokohama, completed in 1917 to commemorate the opening of the port. Nicknamed the “Jack Tower,” it features an elegant clock tower and distinctive early 20th-century Western-style architecture. Today it serves as a cultural venue and event space, with parts of the interior occasionally open to visitors.
© OpenStreetMap contributors
Located in Naka ward. A short walk from Chinatown, Kannai station, or Nihon-ōdōri station, this is probably one of the most fun places to watch a baseball game in Japan. Known as the BayStars Stadium, the Yokohama Baseball Team of the Central League, the Stadium itself was built on the remains of the Cricket Ballpark of the last century for the British delegation. The BayStars Stadium is an open roof stadium with natural grass, very rare in Japan, which prefers to man-made grass to save on costs, and the entertainment boasted throughout the games is trying hard, and doing a good job, by Japanese terms, in trying to have each game hosted at the "home ground" to be as American as possible.
中華街 Chūkagai
Located next to Motomachi-Chinatown (romanized as Motomachi-Chūkagai) station, and a short walk from Ishikawachō station on the Negishi Line, Yokohama's Chinatown is the largest in Japan and dates back to the Opening of Japan in 1859. These days it's unabashedly touristy, but there are plenty of Chinese grocery stores and places to buy a cheap cheongsam dress or jade knick-knacks.
大さん橋
Ōsanbashi Pier is the main international pier at the Port of Yokohama where cruise ships dock. Architecturally renovated with an abstract modern style in 2002, it provides a view of the Minato Mirai skyline. The rooftop garden is open to public and is very beautiful, especially during sunset.
山下公園
You can see the whole port of Yokohama and there's a lot of greenery. A short walk from Motomachi-Chinatown Stn (元町・中華街駅), JR Ishikawachō station (JR石川駅), JR Kannai station (JR関内駅).
氷川丸
This passenger liner made 238 voyages across the Pacific to Seattle and Vancouver between 1930 and 1960, and served as a hospital ship during World War II. The ship is also used for movie and TV location shooting including the 1997 film Moonlight Serenade and the 2005 NHK drama Haru to Natsu.
山手
This is the neighborhood where foreigners settled and still settle. You can make a pleasant walk from the Italian garden near Ishikawachō station to the French park near Motomachi-Chūkagai station. The walk will take you along some nice houses that were previously owned by rich foreigners. Nowadays, these houses can be visited freely. A nice cake shop can be found here as well. The foreigner cemetery is also along this route and houses a small museum with some pictures of the Motomachi shopping street in the old days and some more cartoons showing how the Japanese saw foreigners.