Originally an underground burial chapel
A small church that is not a parish church. It may be part of a larger entity such as a hospital, school, or an alms-house, or it may stand alone.
An enclosed part of a church with its own altar.
in which the relics of the saintThis is a title that the Church bestows on a deceased person who has lived a particularly righteous and faithful life. In the Roman Catholic and Orthodox Church, saints may be venerated (not worshipped). Several saints are also martyrs. to whom the church is dedicated were kept and venerated. The crypt is usually found under the choirIn a church with a cruciform floor plan, the part of the church that lies on the side of the nave opposite to the transept. The main altar is in the choir.. In a pilgrimage church it mostly has two staircases leading to it. This made it easy to organise the influx of pilgrims: they went down one flight of stairs and up the other.