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Photo: Ocdp, CC BY-SA 3.0 via Wikimedia Commons
Kawagoe's castle dates back to the 15th century, unfortunately the castle was disassembled in the 1870s and only the "Yagura" (tower) and primary hall (Honmaru Goten) still remain. These days the main hall serves as a small museum.
Kawagoe Castle is a flatland Japanese castle in the city of Kawagoe, in Japan's Saitama Prefecture. It is the closest castle to Tokyo to be accessible to visitors, as Edo castle is now the Imperial palace, and largely inaccessible.
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川越市立博物館
Useful after visiting the warehouse district as it contains information on how the warehouses were built. Otherwise your average local museum detailing local history with artifacts and models. Next door is a small art museum with a collection of local art.
川越歴史博物館
時の鐘
This bell tower (litt. "Bell of Time") is a famous landmark.
大沢家住宅
Built it in 1792, this warehouse from where the Osawa family traded Miso and Soy, survived the inferno of the great fire, and today stands as the oldest storehouse in Kawagoe. The first floor contains a store while the second floor houses a small exhibition.
服部民族資料館
While there is, in fact, nothing relating to folklore in the folklore museum, the old Hattori family for which is warehouse is named, morphed into a medical company. So you'll find a small display of old medicines, advertisements... and sandals.
川越まつり会館
If you don't happen to be in Kawagoe during the yearly festival held in October, you can get a feel for it in this museum, which exhibits the great floats used in the procession and screens a 5 minute movie about the festival. Naturally the museum also details the history of the festival in Japanese.