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These ramparts, constructed in the 2nd century, had more of a representative than defensive purpose. They measured 5444 metres in length and had two main gates, one towards Cassel and another towards Colonia Agrippina and two smaller gates. The best preserved parts are in the northwest along the Cesarlaan and in the southwest along Cottalaan and Sabinuslaan. In the latter place you can see a replica of the ramparts - how it looked in Roman times - and replicas of Roman war machines.
Onze-Lieve-Vrouwe Basiliek
One of the most beautiful medieval monuments in the world. Built in Gothic style in the 13th century, where excavations have produced some of the richest archaeological finds in Flanders. Archaeological excavations have proven the presence of an edifice here starting from the 4th century, while a Carolingian prayer house existed here in the 9th century. The building of the choir of the present basilica began in 1240. Nave, transepts and side chapels were added between the 13th and 15th century. The original Romanesque tower was replaced by the present, 64-m-tall Gothic tower from 1442 until 1541. The basilica's interior is home to the statue of Our Lady of Tongeren, executed in 1475. The treasury is housed in the former hall of the Chapter and comprises one of the richest collections of religious art in Belgium. The basilica has excellent acoustics and is often used for symphony concerts. The belfry tower is a .
OLSint-Catharinabegijnhof
The béguinage is founded in 1257 and is one of the oldest in Flanders. In the second half of the 16th century escalated the rivalry between Catholics and Protestants in which the possessions of the Beguines were looted and destroyed. In the 17th century the béguinage came to an unprecedented boom and the Beguines became wealthy. The wooden houses were replaced by stone ones. Its heyday was at the beginning of the 18th century. The béguinage counted nearly 100 homes and more than 300 Beguines. In the 19th century it was opened up and became a whole with the rest of the town. Since 1998 it is listed as a .
Sint-Catharinakerk
The church in the centre of the Beguinage has elements from many eras, the oldest parts being the Gothic nave and choir from the 13th century.
Romeinse kloostergang
On the east side of the basilica is the Romanesque cloister from the 12th century. This was enlarged in the early 13th century and rebuilt in its present form. The vertically placed tombstones, as well as the corner chapels on the east side, dating from later periods. Between the cloister and the entrance to the church is a Romanesque statue of Christ from the 11th century.
Agnetenklooster
Constructed in the 15th century by monks of the St. Augustine, rebuilt in Gothic style around 1550 after a fire. The southern and northerns wings have been remodeled over the years. The monastery was one of the few buildings spared by the French troops attacking Tongeren in 1677.
Sint-Jan-de-Doperkerk
There has been a house of worship here since 1390, although the building served as a meeting place for the town council in the early 19th century. The oldest parts of the current church are from 1615, including the belltower replacing one that had collapsed. Over the centuries the church has been modified and rebuilt in different styles, the latest reconstruction in 1888 included the choir, side aisles and transept.