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Photo: Sait Can Kutsal, CC BY-SA 4.0 via Wikimedia Commons
Scrappy ruin of a Byzantine church, though the chapel vault is still roofed and has frescoes.
Balatlar Church or Sinope Koimesis Church originally built as a Roman Imperial bath in the 2nd century, the complex, featuring spaces such as the Palaestra, Frigidarium, Tepidarium, Caldarium, and Laconicum, was converted into a church in the late 4th or early 5th century. The church remained in use until the late 20th century and was transformed into an Orthodox burial ground during the Ottoman era, with numerous burials taking place both inside the building and in its courtyard, establishing it as a significant cemetery for the Orthodox community.
© OpenStreetMap contributors
Displays of local culture in the former Aslan Torun mansion.
Bastion overlooking the harbour, first built in the 8th century BC by Hellenistic immigrants from Miletus, but extended and repaired several times, for instance in the 14th century when the Genoese fortified the entire city. From 1887 to 1997 it housed a high security prison, so it features in the works of a dozen Turkish writers whose seditious publications got them slammed in here. You can look around and climb to the rooftop cafe for views. Otherwise not much here, plans for a cultural centre have come to nothing; perhaps it could be an escape room?