While exploring the historic Ano Poli, the Old City or Upper Town, you will stumble upon the old city wall and the Heptapyrgion. It is a Byzantine and Ottoman-era fortress. You can pay to see the renovated interior part, which used to serve as a prison from 1890 to 1990. Enjoy your urban hike up to the monument, check out the panoramic views and sip a frappe in one of the charming cafes in the area. Also known as Edy Kulѐ or Eptapirgio, 'Seven Towers', is a medieval fortress with towers in the northeastern part of Thessaloniki. Despite its name, the fortress has ten towers. The fortress was built in the IX century, and some parts of it were built later. Like the White Tower, it was used as a prison from the late 19th century until 1978.

Bahrain's grand mosque, named after the founder of the country, is a sight to behold. It's one of the largest mosques in the world, accommodating 7,000 worshipers and containing a library with many ancient volumes. Its precious materials were brought from all over the world and processed by local craftspeople: visitors have been endlessly fascinated by the huge domes and the beautiful calligraphy ornamenting the walls. Guided tours are available in both English and Arabic.

The Suermondt-Ludwig-Museum showcases art from antiquity to modernity and everything in-between, with its medieval sculpture collection being particularly notable. It also houses significant works by artists like Rembrandt, Cranach, Antoon van Dyck, Otto Dix and Max Beckmann. The museum's eclectic collection includes a print room, glass paintings, Flemish tapestries, and goldsmith works, offering a comprehensive view of artistic evolution.