Western Wall

The Western Wall is part of the ancient wall around the western slope of the Temple Mount in the Old City that survived the destruction of the Second Temple. The greatest shrine of Judaism outside the Temple Mount itself, it has for centuries been a symbol of faith and hope for many generations of Jews, a place of pilgrimage and prayer.

Israel Postal service offers a service to deliver notes with wishes and prayers to the Western Wall. They are received and once every few months opened, folded and, in a ceremony overseen by a senior rabbi, squeezed into the cracks of the Western Wall, in Jerusalem's Old City.
Some are from Jews, some from Christians, some from believers of other faiths.