In the city of Aachen, in North Rhine-Westphalia, Germany.

 Best known as the capital of Charlemagne's Frankish empire, today's Aachen sits at the juncture where Germany meets the Netherlands (the Dutch know it as Aken) and Belgium (where "Walloons" call it Aix-la-Chapelle).

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(in the North Rhine–Westphalia Land [state] of western Germany. Aachen is one of Europe's most important cities with historical significance. This prominent city is where several German Kings were crowned. The city is filled with buildings dating back to the medieval period, old city gates, and beautiful fountains. It is famous for its curative hot springs and spas and has been a visiting place for royal families since Ancient Roman times. Aachen Cathedral (shown here) is also the final resting place of King Charlemagne. Some of the other major attractions are Aachen Cathedral Treasury, Rathaus, (the City Hall) Couven-Museum, and the Suermondt-Ludwig-Museum.

+ Located at the northern foothills of the High Fens and the Eifel Mountains. Aachen is the westernmost (larger) city in Germany.

+ The once Celtic settlement was equipped with several thermae in the course of colonization by Roman pioneers settling at the warm Aachen thermal springs around the 1st century CE. After the withdrawal of Roman troops, the vicus Aquae Granni was Germanized by the Franks around the 5th century. This was followed by a period of sedentism under first Merovingian and then Carolingian rule. With the completion of the Carolingian Palace of Aachen at the transition to the 9th century, Aachen was constituted as the main royal residence of the Frankish Empire ruled by Charlemagne. After the 843 Treaty of Verdun, the city found itself within the borders of Middle Francia, until it became part of East Francia after the 870 Treaty of Meerssen (870). It later was a city within the Holy Roman Empire and was granted city rights in 1166 by Emperor Frederick Barbarossa, becoming an imperial city. (It served as the coronation site where 31 Holy Roman Emperors were crowned Kings of the Germans from 936 until Frankfurt am Main became the preferred place of coronation.

+ As a Rhineland city, Aachen is one of the main centers of carnival celebrations (which Bavarians call Fasching) in Germany.

+ Aachen hosted several peace conferences, including those ending the War of Devolution (1668) and the War of the Austrian Succession (1748). Occupied by Napoleon’s army in 1794 and annexed by France in 1801, it was given to Prussia after the Congress of Vienna (1814–15). The city was severely damaged during World War II, and it became the first large German city to fall to the Allies (on 20 October 1944).

+ Other notable landmarks are the Suermondt Ludwig Museum and the fountain, which is surmounted by a statue of Charlemagne, in the city's market square. The nearby hot springs are much frequented; Schwertbad-Quelle, in the suburb of Burtscheid, is the warmest spring in Germany, with an average high water temperature of 169 °F (76 °C).