Best places to visit in Thessaloniki

Thessaloniki (Greek: Θεσσαλονίκη, Thessaloníki [θesaloˈnici], also familiarly known as Thessalonica, Salonica, or Salonika is the second-largest city in Greece, with over 1 million inhabitants in its metropolitan area, and the capital of Greek Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace.
It's 06:22 right now , with overcast clouds and the temperature of 13.24°C (55.832°F) in Thessaloniki.