Cross of Lothair

The Aachen Cathedral Treasury (German: Aachener Domschatzkammer) is a museum of the Roman Catholic Diocese of Aachen under the control of the cathedral chapter, which houses one of the most important collections of medieval church artworks in Europe. In 1978, the Aachen Cathedral Treasury, along with Aachen Cathedral, was the first monument on German soil to be entered in the List of UNESCO World Heritage Sites. The treasury contains works from Late Antique, Carolingian, Ottonian, Staufen, and Gothic times. The exhibits are displayed in premises connected to the cathedral cloisters.

The Proserpina sarcophagus is a Roman marble sarcophagus from the first quarter of the third century AD, in which Charlemagne was probably interred on 28 January 814 in Aachen cathedral. It is displayed today in the Aachen Cathedral Treasury.

The Aachen tramway network (German: Straßenbahnnetz Aachen) was the backbone of public transport in Aachen, now in the federal state of North Rhine-Westphalia, Germany, and the surrounding areas from 1880 to 1974. The track gauge was 1,000 mm (3 ft 3+3⁄8 in), see Nordrhein-Westfalen. At times, the network also extended into Belgium and the Netherlands. At its maximum extent, its route length was 181.4 kilometres (112.7 mi) and its line length was 213.5 kilometres (132.7 mi). In 1914, it was the fourth largest tramway network in Germany. Also, it was one of the most extensive German interurban networks. In 1974, the last tramway in the network was closed. The network was operated from 1880 by the Aachener und Burtscheider Pferdeeisenbahn-Gesellschaft (in English: Aachen and Burtscheid Horse Railway Company), which in 1894 became the Aachener Kleinbahn-Gesellschaft (AKG, in English: Aachen Light Railway Company). In 1942 the name was changed to Aachener Straßenbahn und Energieversorgungs-AG (ASEAG, in English: Aachen Tramway and Power Company). It is now a bus company, but the company name still refers to trams.

The Aachener Thermalquellen, also known as the Thermal Springs of Aachen and Burtscheid, are a system of more than 30 thermal mineral springs located in the area around Aachen (Aix-la-Chapelle), Germany. The area has been known for its hot sulfur springs for thousands of years. The hot mineral water aquifer flows from the Upper Devonian limestones that meet the Variscan thrust front of the Rhenish Massif, and flow through the city center of Aachen in a 500m long by 50m (maximum width), that emerges from the source at numerous spring heads. Four of these spring heads are still accessible; two are managed. The hot spring flow from Burtscheid (a district of Aachen) is 2200m long with numerous spring heads. The hot springs have been used for balneotheraputic purposes since the early Roman settlement in Aachen. The historical political and economic growth of Aachen developed around the springs, in particular mineral water production, the spa and bathing sector, and the textile industry. Later the Franks arrived. The first known written text about Bad Aachen (Aachen baths) is linked to the Frankish king, Pippin the Short. Charlemagne inherited Pippin's manor at Bad Aachen sometime after 766 AD.Aachen came to be known as an elegant European spa town where personages such as George Frideric Handel, Albrecht Dürer, Voltaire, and Peter the Great "took the waters” at Bad Aachen.

Aachen ( AH-khən; German: [ˈaːxn̩] (listen); Aachen dialect: Oche [ˈɔːxə]; French and traditional English: Aix-la-Chapelle;) is, with around 249,000 inhabitants, the 13th-largest city in North Rhine-Westphalia, and the 28th-largest city of Germany. It is the westernmost city in Germany, and borders Belgium and the Netherlands to the west, the triborder area. It is located between Maastricht (NL) and Liège (BE) in the west, and Bonn and Cologne in the east. The Wurm River flows through the city, and together with Mönchengladbach, Aachen is the only larger German city in the drainage basin of the Meuse. Aachen is the seat of the City Region Aachen (German: Städteregion Aachen). Aachen developed from a Roman settlement and thermaecode: lat promoted to code: la (bath complex), subsequently becoming the preferred medieval Imperial residence of Emperor Charlemagne of the Frankish Empire, and, from 936 to 1531, the place where 31 Holy Roman Emperors were crowned Kings of the Germans. One of Germany's leading institutes of higher education in technology, the RWTH Aachen University (Rheinisch-Westfälisch Technische Hochschule Aachencode: deu promoted to code: de ), is located in the city. Its university hospital Uniklinikum Aachen is Europe's largest single-building hospital. Aachen's industries include science, engineering and information technology. In 2009, Aachen was ranked eighth among cities in Germany for innovation. The regional dialect spoken in the city is a Central Franconian, Ripuarian variant with strong Limburgish influences from the dialects in the neighbouring Netherlands. As a Rhenish city, Aachen is one of the main centres of carnival celebrations in Germany, along with Cologne, Mainz and Düsseldorf. The culinary specialty for which the city is best known is Aachener Printen, a type of gingerbread.

The Throne of Charlemagne (German: Karlsthron or Aachener Königsthron, "Royal Throne of Aachen") is a throne erected in the 790s by Charlemagne, as one of the fittings of his palatine chapel in Aachen (today's Aachen Cathedral) and placed in the Octagon of the church. Until 1531, it served as the coronation throne of the King of the Romans, being used at a total of thirty-one coronations. As a result, especially in the eleventh century, it was referred to as the totius regni archisolium ("Archstool of the Whole Realm"). Charlemagne himself was not crowned on this throne, but instead in the Old St. Peter's Basilica in Rome by Pope Leo III in 800 AD.

The Barbarossa Chandelier (German: Barbarossaleuchter) was made on the order of Emperor Frederick I, nicknamed Barbarossa, and his wife Beatrice sometime between 1165 and 1170 and was installed under the cupola of the Palatine Chapel in Aachen Cathedral. The chandelier was a donation in honour of Mary, Mother of God, the patroness of Aachen Cathedral and simultaneously represented a tribute to the builder of the cathedral, Charlemagne.

Aachen Chapel of Hungary (Hungarian: Aacheni magyar kápolna) is a side chapel of the Aachen Cathedral (German: Aachener Dom), one of the oldest cathedrals in Europe.

The Bust of Charlemagne (de: Karlsbüste) is a reliquary from around 1350 which contains the top part of Charlemagne's skull. The reliquary is part of the treasure kept in the Aachen Cathedral Treasury. Made in the Mosan region (the valley of the River Meuse), long a centre of high-quality metalwork, the bust is a masterpiece both of late Gothic metalwork and of figural sculpture. The Bust of Charlemagne, as a masterpiece of Mosan goldwork, initiated a height of silver-gilt naturalistic reliquary busts.

Aachen Cathedral (German: Aachener Dom) is a Roman Catholic church in Aachen, Germany and the seat of the Roman Catholic Diocese of Aachen. One of the oldest cathedrals in Europe, it was constructed by order of Emperor Charlemagne, who was buried there in 814. From 936 to 1531, the Palatine Chapel saw the coronation of thirty-one German kings and twelve queens. The church has been the mother church of the Diocese of Aachen since 1930. In 1978, Aachen Cathedral was one of the first 12 items to be listed on the UNESCO list of World Heritage sites, because of its exceptional artistry, architecture, and central importance in the history of the Holy Roman Empire.

The Palace of Aachen was a group of buildings with residential, political, and religious purposes chosen by Charlemagne to be the center of power of the Carolingian Empire. The palace was located north of the current city of Aachen, today in the German Land of North Rhine-Westphalia. Most of the Carolingian palace was built in the 790s but the works went on until Charlemagne's death in 814. The plans, drawn by Odo of Metz, were part of the program of renovation of the kingdom decided by the ruler. Today much of the palace is destroyed, but the Palatine Chapel has been preserved and is considered a masterpiece of Carolingian architecture and a characteristic example of architecture from the Carolingian Renaissance.

Aachen-Mitte is one of the seven boroughs of the city of Aachen, Germany, and contains the quarters of Beverau, Bildchen, Burtscheid, Forst, Frankenberg, Grüne Eiche, Hörn, Lintert, Pontviertel, Preuswald, Ronheide, Rothe Erde, Stadtmitte, Steinebrück and West. As the center of the city of Aachen, the district is by far the most populated, with over 168,000 residents. It contains both the Aachen Cathedral and Aachen Rathaus, which are each near the city center, as well as Aachen's main theatre. Numerous squares, including Hansemannplatz, Kaiserplatz, and Lindenplatz are likewise contained within the district, as is the medieval Ponttor, which was one of the original gates in the wall surrounding the city.