The Primatial Basilica of the Blessed Virgin Mary Assumed Into Heaven 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 Saint Mary of the Assumption and Saint Adalbert.
It is the biggest building in Hungary and the 18th biggest church in the world. 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, with a diameter of 33.5 metres, and is 100 m high from outside, counted from the crypt.