The "Mororan Camp Site, Nanbu Domain Camp Site in East Ezo", the only nationally designated historic site in the city, is one of the representative camp sites of the late modern period in Hokkaido. In 1855, 28 people including Jujiro Nitobe (father of Inazo Nitobe), a magistrate of accounts, conducted a preliminary survey and found that the former camp was located in Hakodate, and that Muroran, which was a natural harbor where the Etomo place was operated, had a pekereota (meaning white or bright sandy beach. In Muroran, which was a natural harbor where the Etomo place was located, the decision was made to build a sub-basement in Pekeleota (meaning "white or bright beach", near the present Jinyamachi in Muroran).

From March of the following year (lunar calendar), construction work began with 18 carpenters including Muneyoshi Murata of the Nanbu domain, 4 plasterers, 5 roofers, 40 dojikata, woodworkers, and about 45 others, and the camp was completed in September of the same year.

The site, where the Nanbu clan warriors looked out over the sea and guarded the east end of Eruption Bay at the end of the Edo period, was designated as a historic site in 1934, and has been preserved for many years since. Today, the site is surrounded by greenery and is a popular spot for cherry blossom viewing.