The Cathedral Basilica of St. John the Apostle is one of the largest churches in Hungary, a monumental Neoclassical building constructed between 1831 and 1836. The scale is extraordinary for a provincial city: the two towers are each 54 metres tall, and the main hall can seat several thousand people. The exterior is in a severe, grand style designed to dominate the cityscape; the interior is warmer, with ceiling frescoes, carved wooden choir stalls, and the early nineteenth-century organ.
The basilica faces the Archbishop's Lyceum across Eger's main square, and the two buildings together create an ensemble of Catholic institutional architecture that gives the city much of its character. The cathedral is still an active church and is open for visitors outside service hours.