In front of the Argentine National Historical Museum, is this structure, designed in Saint Petersburg by the architect of the Holy Synod of Russia, Mikhail Preobrazensky, started in 1898, and finally built and adapted in 1901, and honorably, by the Norwegian architect (based in Argentina) Alejandro Christophersen, in collaboration with the engineer Pedro Coni.

It is in a remarkable 17th-century Russian style, with five blue Onion domes and golden stars, crowned by Orthodox crosses attached with chains pointing to the east.

On its sides you can see two murals, one called "Baptism of Russia" and another with motifs about the Theotokos, Jesus and Saint John.

The temple is on the second floor of the structure, and it is accessed through a richly decorated door to the left of the facade.

Its altar is intentionally oriented towards the east, it also has several icons, highlighting among all the one dedicated to the Holy Trinity, which gives the church its name.