(Source)

Built from 1921-1922, it originally served as a reservoir for water coming from Malasag Hills. It is now considered the city’s oldest known surviving public structure. It was renovated and improved into a museum in 2008.

All 3 floors mostly contain old photographs of famous Cagayanons with historical significance or with big contributions to the city, historical events and lifestyle events. You can only have your picture taken on the ground floor. There is an entrance fee of PhP20.00.

The City Museum is open from 9:30 a.m. to 5:00 p.m., though it is closed on weekends and holidays. (Source)