Its rich history and underground interior also pose an interest for tourists, making it one of the main attractions of the city.

As one of the oldest buildings in Ruse, the Holy Trinity Cathedral was declared a cultural monument of national importance in 1983.

The remains of catacombs, possibly dating back to the fifth century, are located in the southwest corner of the temple.

The hexagonal belfry is 19 m high and was built with stones from the fortification facilities around the Ruschuk fortress, demolished by decision of the Berlin Congress from July 1878.

In the cathedral's narthex are the graves of four bishops of the Dorostolo-Cherven diocese: Grigoriy, Valisiy, Mihail, and Sofroniy.