The Church of Saints Cyril and Methodius, completed in 1907, honours the 9th-century Byzantine brothers who evangelised the Slavs and are credited with creating the Cyrillic alphabet. Designed by Italian architect Ricardo Toscani, this Orthodox cathedral features a three-nave basilica with marble columns and a striking stained-glass depiction of the saints. Known for its intricate iconostasis and frescoes by renowned Bulgarian artists, the church underwent foundation repairs in 2016 and remains a significant cultural and spiritual landmark.

Centre Charlemagne is a modern city museum in the heart of the historical centre. Here, the history of city comes to life, explaining how Aachen became the residence of the Carolingian rule and the medieval city of coronations. Apart from that, the Centre Charlemagne is the starting point of the Route Charlemagne that connects all the important places in the city.

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.