Karl Marx House

The Theater Trier is the municipal theatre of Trier, Rhineland-Palatinate, offering opera and musical, dance and drama. The company dates back to 1802. The current house was completed in 1964, and needs renovation. The director (Intendant) since 2018 is Manfred Rolf Langner Since 1995, the theatre has run a series of unknown operas, initiated by Heinz Lukas-Kindermann. It included world premieres such as Zemlinsky's Sarema, Die unendliche Geschichte by Siegfried Matthus, and Fausta by Heinz Heckmann, German premieres such as The Voyage by Philip Glass, and revivals of neglected repertoire such as Karl Goldmark's Merlin and Koanga by Frederick Delius.

The Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier are buildings and monuments of particular historical importance in Trier, Germany, that were together listed as a UNESCO World Heritage Site in 1986. These sites demonstrate the political, economic, and historical importance of Trier during the Roman Empire as one of the four capital during the Tetrarchy period, and as a prominent city during the early days of the Holy Roman Empire in the Middle Ages.From UNESCO/CLT/WHC: "Trier is an example of a large Roman capital after the division of the empire. The remains of the Imperial Palace, in addition to the Aula Palatina and the Imperial Thermae, are impressive in their dimensions. The city bears exceptional testimony to Roman civilization owing to the density and the quality of the monuments preserved: the bridge, the remains of the fortified wall, thermae, amphitheatre, storehouses, etc. In particular, funerary art and the craftsmanship of potters, glassworkers, and moneyers flourished in the city."In 2009, the site was featured on a golden 100-Euro coin.

Sarre was a department in the First French Republic and First French Empire. Its territory is now part of Germany and Belgium. Named after the river Saar (French: Sarre), it was created in 1798 in the aftermath of the Treaty of Campo Formio of 18 October 1797 which ceded the left bank of the Rhine to France. Despite its name it covered a much larger area than the historical area known as the Saarland. Prior to the French occupation of the area from 1793 onward, its territory had been divided between the Electorate of Trier, Nassau-Saarbrücken and the Electorate of the Palatinate (the Duchy of Zweibrücken and the County of Veldenz). Its territory is now part of the German states Rhineland-Palatinate and Saarland as well as a tiny adjacent section of the Belgian province of Liège. Its capital was Trier. The department was subdivided into the following arrondissements and cantons (situation in 1812): Trier (French: Trèves), cantons Bernkastel, Büdlich, Konz, Pfalzel, Saarburg, Schweich, Trier and Wittlich. Birkenfeld, cantons: Baumholder, Birkenfeld, Grumbach, Hermeskeil, Herrstein, Kusel, Meisenheim, Rhaunen and Wadern. Prüm, cantons: Blankenheim, Daun, Gerolstein, Kyllburg, Lissendorf, Manderscheid, Prüm, Reifferscheid and Schönberg. Saarbrücken (French: Sarrebrück), cantons: Blieskastel, Lebach, Merzig, Ottweiler, Saarbrücken, Sankt Wendel and Waldmohr.Its population in 1812 was 277,596, and its area was 493,513 hectares (1,219,500 acres).After Napoleon was defeated in 1814, most of the department became part of Prussia, with smaller parts assigned to Duchy of Oldenburg (Birkenfeld) and Bavaria. The cantons of Sankt Wendel and Baumholder were given to Saxe-Coburg-Saalfeld as the Principality of Lichtenberg, which was sold to Prussia in 1834. The canton of Meisenheim was given to Hesse-Homburg, which was annexed to Prussia in 1866. France retained Saarbrücken but, after Waterloo, it was punished and it lost the town together with Saarlouis from nearby Moselle. The former Schönberg canton would later be included in the Eupen-Sankt Vith-Malmedy plebiscite area following World War I.

St. Gangolf's Church is a Roman Catholic church in Trier, Germany. It is dedicated to St. Gangulphus. After Trier Cathedral, it is the second oldest church building in the city.

Trier ( TREER, German: [tʁiːɐ̯] ; Luxembourgish: Tréier [ˈtʀəɪɐ] ), formerly and traditionally known in English as Trèves ( TREV, French: [tʁɛv]) and Triers (see also names in other languages), is a city on the banks of the Moselle in Germany. It lies in a valley between low vine-covered hills of red sandstone in the west of the state of Rhineland-Palatinate, near the border with Luxembourg and within the important Moselle wine region. Founded by the Celts in the late 4th century BC as Treuorum and conquered 300 years later by the Romans, who renamed it Augusta Treverorum ("The City of Augustus among the Treveri"), Trier is considered Germany's oldest city. It is also the oldest seat of a bishop north of the Alps. Trier was one of the four capitals of the Roman Empire during the Tetrarchy period in the late 3rd and early 4th centuries. In the Middle Ages, the archbishop-elector of Trier was an important prince of the Church who controlled land from the French border to the Rhine. The archbishop-elector of Trier also had great significance as one of the seven electors of the Holy Roman Empire. Because of its significance during the Roman and Holy Roman empires, several monuments and cathedrals within Trier are listed as a UNESCO World Heritage Site.With an approximate population of 110,000, Trier is the fourth-largest city in its state, after Mainz, Ludwigshafen, and Koblenz. The nearest major cities are Luxembourg City (50 km or 31 mi to the southwest), Saarbrücken (80 kilometres or 50 miles southeast), and Koblenz (100 km or 62 mi northeast). The University of Trier, the administration of the Trier-Saarburg district and the seat of the ADD (Aufsichts- und Dienstleistungsdirektion), which until 1999 was the borough authority of Trier, and the Academy of European Law (ERA) are all based in Trier. It is one of the five "central places" of the state of Rhineland-Palatinate. Along with Luxembourg, Metz and Saarbrücken, fellow constituent members of the QuattroPole union of cities, it is central to the greater region encompassing Saar-Lor-Lux (Saarland, Lorraine and Luxembourg), Rhineland-Palatinate, and Wallonia.

The Barbara Baths (German: Barbarathermen) are a large Roman bath complex in Augusta Treverorum, modern-day Trier, Germany. Stretching over 42,000 square meters, it is the largest Roman bath north of the Alps. Along with other sites in Trier, the bath complex was designated a UNESCO World Heritage Site in 1986 as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier site, because of its historical importance and sprawling architecture.

The Aula Palatina, also called Basilica of Constantine (German: Konstantinbasilika), at Trier, Germany, is a Roman palace basilica and an early Christian structure built between AD 300 and 310 during the reigns of Constantius Chlorus and Constantine the Great.Today it is used as the Church of the Redeemer and owned by a congregation within the Evangelical Church in the Rhineland. The basilica contains the largest extant hall from antiquity (see List of ancient Greek and Roman roofs. The hall has a length of 67 m, a width of 26.05 m and a height of 33 m. Because of its testimony to the imperial importance of Trier during the Roman Empire and its architecture, the Aula Palatina was designated as a UNESCO World Heritage Site in 1986 as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier site.

The Diocese of Trier, in English historically also known as Treves ([tɾivz]) from French Trèves, is a Latin Church ecclesiastical territory or diocese of the Catholic church in Germany. When it was the archbishopric and Electorate of Trier, it was one of the most important states of the Holy Roman Empire, both as an ecclesiastical principality and as a diocese of the church. Unlike the other Rhenish dioceses—including Mainz and Cologne–Trier was the former Roman provincial capital of Augusta Treverorum. Given its status, Trier has continuously been an episcopal see since Roman times and is one of the oldest dioceses in all of Germany. The diocese was elevated to an archdiocese in the time of Charlemagne and was the metropolitan for the dioceses of Metz, Toul, and Verdun. After the victory of Napoleon Bonaparte of France, the archdiocese was lowered to a diocese and is now a suffragan in the ecclesiastical province of the Archdiocese of Cologne. The diocesan cathedral is the Cathedral of Saint Peter. The Cathedral Chapter retains the right to elect the bishop, rather than selection by papal appointment.

The High Cathedral of Saint Peter in Trier (German: Hohe Domkirche St. Peter zu Trier), or Trier Cathedral (German: Trierer Dom), is a Roman Catholic cathedral in Trier, Rhineland-Palatinate, Germany. It is the oldest church in Germany and the largest religious structure in Trier, notable for its long life span and grand design. The central part of the nave was built of Roman brick in the early fourth century, resulting in a cathedral that was added onto gradually in different eras. The imposing Romanesque westwork, with four towers and an additional apse, has been copied repeatedly. The Trier Cathedral Treasury contains an important collection of Christian art. In 1986 the church was listed as a UNESCO World Heritage Site, as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier.

The Liebfrauenkirche (German for Church of Our Lady) in Trier, is, according to UNESCO, "the earliest church built in French High Gothic style outside France." It is designated as part of the Roman Monuments, Cathedral of St Peter and Church of Our Lady in Trier UNESCO World Heritage Site. The Trier Dom (cathedral) is next to it, and the two buildings share a common wall.

The Trier Imperial Baths (German: Kaiserthermen) are a large Roman bath complex in Trier, Germany. The complex was constructed in the early 4th century AD, during the reign of Constantine I. During that time, Trier was a major imperial hub, being a primary residence for Constantine's son Crispus. The baths were built around hot water pools reaching 40°C. Underneath the complex was a network of underground passageways used by the staff which can still be seen today, along with the remains of the sewer system. However, the baths were never completed and were made into a castle in the Middle Ages.

The Electoral Palace (German: Kurfürstliches Palais) in Trier, Germany, was the residence of the Archbishops and Electors of Trier from the 16th century until the late 18th century. It now houses various offices of the federal government and often hosts classical music concerts.