"Our Lady of Tinos" church....

“Our Lady of Tinos” is the major Virgin Mary shrine in Greece. It is located in the town of Tinos on the island of Tinos. You can also hear it as “Panagía Evangelístria” and more commonly “Megalochari of Tinos” (She of Great Grace). Tinos is a Greek island situated in the Aegean Sea and is located near the geographical center of the Cyclades island complex.

Because of the Panagía Evangelístria church, with its reputedly miraculous icon of Virgin Mary that it holds, Tinos is also the center of a yearly pilgrimage that takes place on the date of the Dormition of the Virgin Mary. This is probably the most notable and still active yearly pilgrimage in the region of the eastern Mediterranean, equal to what is Lourdes in France or Fatima in Portugal. Many pilgrims make their way the 800 meters from the ferry dock to the church on their hands and knees as sign of devotion.

The church complex is built around a miraculous icon which according to tradition was found after the Virgin appeared to the nun Pelagia and revealed to her the place where the icon was buried. The icon is widely believed to be the source of numerous miracles. It is by now almost completely encased in silver, gold, and jewels, and is commonly referred to as the "Megalochari". By extension, the church is often called the same, and is considered a protectress of seafarers and healer of the infirm.

The icon was found on the very first days after the creation of the modern Greek State, henceforth Our Lady of Tinos was declared the patron saint of the Greek nation.

The icon was at the time thought to be the handwork of St. Luke the Evangelist, a possibility that can neither be confirmed nor ruled out, and a nationwide fund collection was carried out for the building of a church to house it.

The church is officially dedicated to the Annunciation of the Virgin Mary. The major feast of the church, however, is on 15 August when the Dormition of the Virgin Mary is commemorated by the Greek Orthodox Church, following the strong tradition of the Aegean Islands where the Dormition is grandly celebrated in mid-August as the principal summer feast.

Sources,

https://en.wikipedia.org/wiki/Our_Lady_of_Tinos

The photos are mine.