Theresienkirche (St. Theresa's Church), Aachen

Theresienkirche (St. Theresa’s Church) began as the church of a Carmelite convent dedicated to Saint Teresa of Ávila. The present building was constructed in the 18th century, mainly between 1739 and 1745, under Laurenz Mefferdatis, with interior work linked to Johann Joseph Couven. Its layout follows the line of an 18th-century street rather than the usual east–west axis.

Inside, the church shows Baroque forms with Rococo details. The main altar is a small columned structure made of oak, with gilded Corinthian capitals and carved angel figures. To create a more regular interior shape, Mefferdatis used a triangular staircase, allowing the floor plan to appear largely rectangular.

During the Second World War, the church burned out in 1943, and it was rebuilt in the 1950s in a way that aimed to restore its earlier appearance. Today it is no longer a standard Catholic parish church; it is used by the “Holy Trinity” Romanian Orthodox community, which holds services here on Sundays.