The Holy Trinity Church and especially its tall belfry have become a symbol of Bansko as one of the most attractive mountain resorts, successfully combining the charm of its rich historical past and its picturesque location at the foot of the mighty Pirin Mountain with the most modern facilities for recreation – a wide choice of reputable hotels for all tastes and budgets, one of the best ski zone in South-East Europe. The Church dedicated to the Holy Trinity was built in the period of the Bulgarian National Revival. Its inauguration was made in 1835. The architectural plan of the church is a three-nave basilica or more exactly a pseudo-basilica with 44 m length, 22 m width and 12 m height. The walls are 1.1 m thick and entirely constructed of local ashlar, welded together by mortar. Large wooden beams of centuries old white fir (typical for the region) are used in the foundation and for leveling the walls. Part of the church is sunken under the ground level in order to look smaller from the outside and Turks can not get an idea about its real size. The altar piece is set within a skillfully constructed and decorated apse in the form of the half of a 18-angle prism with a remarkable stone cornice on the exterior. The roof is hold in the interior of the church by 12 massive wooden columns of white fir, symbolizing the 12 apostles. http://bansko-guide.com/attraction/holy-trinity-church/

The oldest and best preserved monument of architecture since Roman times in Sofia is the rotunda church St. George. It was built in the beginning of the 4th century AD and, was considered, during the reign of the roman emperor Constantine the Great (reigned 306 – 337) and the flourishing of the ancient town Serdika (the old name of Sofia). It is believed that the rotunda is the oldest building in Sofia. The temple is situated in the courtyard of the Government Office, just a couple of meters of the remains of the ancient fortress Serdika. It is a cylindrical domed structure, built on a square base. Its width is about 9.5 meters in diameter and its height is about 14 meters. The altar room has a square form and four symmetrically placed niches. The main entrance is at the western wall. Originally the building was used for public purposes. After the recognition of Christianity as a religion in the Roman Empire, the rotunda became a baptistery (a building for conversion to Christianity), due to the many conversions, following the authorization of this religion. http://bulgariatravel.org/en/object/234/sofia