Photo: Jarekt, CC BY-SA 3.0 via Wikimedia Commons
Built in 1197, with the minaret added in 1213.
The Great Mosque of Sivas is a historic mosque located in Sivas, Turkey. It was built in the 12th century and is the oldest surviving building in the city. Its minaret was built in the early 13th century.
© OpenStreetMap contributors
The third of the trio, this was built in 1271 by Vizier Sahip Ata Fahrettin Ali. The name means "celestial" or blue, for its tilework. It has an imposing gatehouse with twin minarets leading to a courtyard and cells, nowadays shops. The building originally had a second story, long gone.
Kurşunlu Hamamı
Hamamı are traditional baths in a 16th century building.
This former high school was where Atatürk consolidated his power base in 1919 and launched the struggle for independence. It now hosts three museum collections: congress with mementoes of that era, ethnography, and archeaology.
https://www.kulturportali.gov.tr/turkiye/sivas/gezilecekyer/arkeoloj-muzes327586
Small museum in a former School of Industry built in 1914. It contains fossils and prehistoric, Roman, Byzantine, Seljuk and Ottoman artifacts.