Opposite the 'Nissaki' (Islet) and Customs Office, going uphill, you will find the Industrial Museum of Syros. It is a must see. It's about 15 minutes from the port.
The interactive museum aims to introduce you to Syros' industrial development. It is made up of four buildings, the Katsimantis Dyeworks building, the Anairousis Lead Shot Factory, the Kornilakis Tannery building, and the Velissaropoulos Textile Factory, which facilitates and houses the restoration and maintenance of old machines and tools.