The Basilica of Saint Pius X, informally known as the Underground Basilica, is a large Roman Catholic church and minor basilica, located in the town of Lourdes, France. It is part of the Sanctuary of Our Lady of Lourdes. Lourdes is a major Catholic pilgrimage site and the Catholic Church endorses the belief that the Virgin Mary appeared to Saint Bernadette Soubirous there.
The Basilica of St. Pius X is the largest and most controversial of the Domain's churches. It was completed in 1958 in anticipation of the enormous crowds expected in Lourdes for the centenary of the Apparitions. A modern, concrete building, it is almost entirely underground.
Wikipedia https://en.wikipedia.org/wiki/Basilica_of_St._Pius_X
Official website (French) http://fr.lourdes-france.org/sejour-a-lourdes/carte-de-lourdes/basilique-saint-pie-x
Lourdes Tourist Office http://www.lourdes-infotourisme.com/web/EN/341-basilique-saint-pie.php
Phone +33 5 62 42 78 78
Address Le Sanctuaire, 65100 Lourdes, France
Coordinates 43°5'50.189" N -0°3'12.277" E