The late eleventh century and all through the twelfth and thirteenth century was the era of the crusades, which saw a growing interest in the sites consecrated by the human presence of Jesus in the Holy Land. But now pilgrims need not go so far; in England itself there was a 'new Nazareth' built by one of their own countrywomen.
The actual house from Nazareth was moved – perhaps even miraculously – to Loreto, and we find that the measurements of the house in Loreto and the house in Walsingham are the same.
Why venerate a house? Because it was there that the Word-made-Flesh lived as Man with mankind.
O God, who through the mystery of the Word made flesh didst in thy mercy sanctify the house of the blessed Virgin Mary, and wondrously place it in the bosom of thy Church: Grant that being made separate from the tabernacles of sinners, we may become worthy to dwell in thy holy house; through the same Jesus Christ thy Son our Lord, who liveth and reigneth with thee, in the unity of the Holy Ghost, ever one God, world without end. Amen.