The principal Bulgarian Orthodox cathedral of the city, standing on the main square at Largo. The current building dates from the 1860s with a rebuilt dome from the 1930s; an earlier wooden church on the same spot served Sofia from the tenth century.
The interior is dim, with heavy 1970s frescoes and a treasury of medieval reliquaries. The cathedral is the heart of working Bulgarian Orthodox life in the capital — go on a Sunday morning and you will hear the choir from outside the doors. Free entry, modest dress expected.