Please answer the following question: Berlin Historic District (Berlin Nevada) - The Berlin Historic District encompasses the ghost town of Berlin Nevada. The town was established in 1897 as part of the Union Mining District after the opening of the Berlin Mine the previous year. The town never prospered to the same extent as other boom towns like Tonopah and Goldfield and declined following the Panic of 1907. The town was largely abandoned by 1911. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Building