The Saint Sofia Church is the second oldest church in the Bulgarian capital Sofia, dating to the 6th century. In the predecessor building took place the Council of Serdica held most probably in 343 and attended by 316 bishops.
The National Archaeological Museum is an archaeological museum in the centre of Sofia, the capital of Bulgaria. It occupies the building of the largest and oldest former Ottoman mosque in the city, originally known as Koca Mahmut Paşa Camii.
The Church of St George is an Early Christian red brick rotunda that is considered the oldest building in Sofia, the capital of Bulgaria. It is situated behind the Sheraton Hotel, amid remains of the ancient town of Serdica.