Roman Monuments, Cathedral of St Peter and Church of Our Lady in Trier

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.

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 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 Karl Marx House museum (German: Karl-Marx-Haus) is a biographical and writer's house museum in Trier (Rhineland-Palatinate, Germany). In 1818, Karl Marx, the father of Marxism, which influenced both modern socialism and communism, was born in the house. It is now a museum about Karl Marx's life and writings as well as the history of communism.

The Roman Bridge (German: Römerbrücke) is an ancient structure in Trier, Germany, over the Moselle. It is the oldest standing bridge in the country, and the oldest Roman bridge north of the Alps. The nine bridge pillars date from the 2nd century AD, replacing two older, wooden bridges that date at least as far back as 17 BC. In Roman times, tossing a coin off of the bridge into the Moselle was an offering of good luck. The upper part was renewed twice, in the early 12th and in the early 18th century, after suffering destruction in war. Along with other Roman and Early Gothic sites in Trier, the bridge was inscribed on the UNESCO World Heritage List in 1986 because of its historical importance and architecture.

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.

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 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 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.

The Rheinische Landesmuseum Trier is an archaeological museum in Trier, Germany. The collection stretches from prehistory through the Roman period, the Middle Ages to the Baroque era with a strong emphasis on the Roman past of Augusta Treverorum, Germany's oldest city. Its collections of (local) Roman sculptures, Roman mosaics and frescos are among the best in Germany (along with those of the Römisch-Germanisches Museum in Cologne, the Rheinisches Landesmuseum Bonn and the Römisch-Germanisches Zentralmuseum in Mainz).

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.