The Primatial Basilica of the Assumption of the Blessed Virgin Mary and St Adalbert (Hungarian: Nagyboldogasszony és Szent Adalbert prímási főszékesegyház), also known as the Esztergom Basilica (Hungarian: Esztergomi bazilika), is an ecclesiastic basilica in Esztergom, Hungary, the mother church of the Archdiocese of Esztergom-Budapest, and the seat of the Catholic Church in Hungary. It is dedicated to the Assumption of Saint Mary and Saint Adalbert.
It is the largest church in Hungary. Its inner area is 5,600 m². It is 118 m long and 49 m wide. It has a reverberation time of more than 9 seconds. Its dome, forming a semi-sphere, is situated in the middle, and it has 12 windows. It is 71.5 m high inside (which makes it one of the tallest domes in the world), with a diameter of 33.5 metres, and is 100 m high from outside, the stairs count 400 steps counted from the crypt.
The huge crypt, built in Old Egyptian style in 1831, is today the resting place of late archbishops, among others, József Mindszenty, famous for his opposition to both Nazi and Communist rule.