These picturesque ruins of an early Christian Roman building lie near the Bulgarian town of Perushtitsa. Apart from being one of the oldest churches in Europe, The Red Church is also the only Christian temple with altar facing North.

Originally built as a martyrium (a place which stored the remains of martyrs who died for Christianity) it was build in the 4th to 5th centuries, making it one of the earliest surviving Christian structures in the Roman empire after Christianity was officially recognized as a religion.

The building was impressive in size, the main dome standing at over 32 meters high, 14 of which still stand tall. The martyrium was later expanded and converted to a basilica. There are several layers of frescoes remaining, all of which were removed and preserved in local museums The church was destroyed by the Crusaders of the 4th crusade in the 13th century.