Describe the term 'marian apparition' and explain its relationship to visiting pilgrimage sites

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 A Marian apparition is where Mary the mother of God appears spiritually to a person and the person then spreads the word and the Church investigates. Should the Church approve of the site then the site is blessed and pronounced a Marian Site, where pilgrims can come and connect with their faith and escape the world and come back to God. 

The relationship between visiting a pilgrimage site and a Marian apparition site is that