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Photo: ja:User:Sanjo, CC BY-SA 3.0 via Wikimedia Commons
It is not known when or who built the original castle, but it was expanded by Yoshisuke Ito and used as his residence. One of the palace buildings has been rebuilt as the Sadowara History and Folk Museum (also free). The rest of the former castle can be seen via walking trails on and around the hill.
Sadowara Castle is a Japanese castle located in the Sadowara neighborhood of the city of Miyazaki, Miyazaki Prefecture, on the island of Kyushu, Japan. It is also called Tsurumatsu Castle , and later Shōkaku Castle . During the Sengoku period, it was the stronghold of the Itō clan and later was controlled by the Shimazu clan. Shimazu Toyohisa was command of the castle. During the Edo period, the castle was headquarters of Sadowara Domain, which ruled portions of Hyūga Province from 1603 to 1871. The castle site has been a National Historic Site since 2004.
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フェニックス自然動物園
平和台公園
A park said to be the site where the capital of legendary Emperor Jimmu used to stand. The park is known for Heiwadai Tower (平和の塔) or Peace Tower (also known as the Hakkō ichiu monument) built as a symbol of world peace. It's also home to the famous Haniwa Garden with hundreds of haniwa, which were once placed around ancient burial mounds, scattered around.
宮崎県総合博物館
Features dynamic exhibits about the prefecture's flora and fauna, along with historic and cultural exhibits. Behind the museum are a handful of preserved buildings moved here from villages in Miyazaki Prefecture's interior. The buildings called minka-en (民家園) by locals.
宮崎神宮
A shrine in the city's center, sacred to Japan's first emperor, Jinmu. There are two shrines in the place: one is the main shrine on the east side, and the other one is the Miyazaki Gokoku Shrine (宮崎縣護國神社) on the west side. The Miyazaki Gokoku Shrine, sacred soldiers who died in World War II, is much smaller than the main one. A path between the two shrines can lead visitors to the Miyazaki Prefectural Museum of Nature and History.
宮崎県立美術館
Has a permanent collection but is best visited for its special exhibitions, so it's best to check what will be featured during your visit.
宮崎科学技術館
Has a variety of interactive science exhibits and a planetarium.