Aristotelous Square is the most impressive square in Thessaloniki. It features buildings with monumental architecture inspired by European and colonial models, cafes, shops and restaurants. It is the focal point in big celebrations, such as the coming of the New Year, and is the de facto meeting place during the day. The history of Aristotelous Square began with the Great Fire of 1917 that destroyed two thirds of the city. The French architect Ernest Hébrard designed Aristotelous Square to serve as an end of a monumental axis for Thessaloniki that would stretch from the seafront to Dikastirion Square and the Roman Forum. The final design, built in the 1950s, is a lot more stripped down than Hébrard's original proposal, but still has significant architectural value.

Built as a miniature of the Hagia Sophia in Constantinople in the 7th century, the cathedral contains beautiful Byzantine frescoes and mosaics. Agia Sofia is one of the oldest churches in the city still standing today and is included as a World Heritage Site on the UNESCO list.

Dubrovnik’s baroque Assumption of the Virgin Mary Cathedral was built in the 18th century over the earlier Romanesque Cathedral dating to the 12th century, which was destroyed in the great earthquake of 1667. The Treasury inside the cathedral houses 132 relics of saints dating from the 11th to the 19th centuries. The priceless head, arms and leg relics of St Blaise that were crafted by Dubrovnik goldsmiths date between the 11th and 12th centuries.

Located in the heart of the historic Trinity College, this lavishly illustrated manuscript of the Gospels dates back to the 9th century. A marvel of Early Christian art is housed in the 65-metre Long Room in the Old Library — an incredible sight in itself. The room with its barrel-vaulted ceiling inspired the imagery of the Jedi Archive in Star Wars Episode II.