Basilica of St. Pius X (Lower Basilica)

The Basilica of St. Pius X, affectionately known as the Underground Basilica, stands as a monumental architectural feat within the Sanctuary of Our Lady of Lourdes. Located at 1, avenue Monseigneur Théas, this massive structure covers approximately 12,000 square meters with an impressive oval plan measuring 201 meters by 81 meters. Designed to accommodate up to 25,000 people, it serves as a crucial space for large-scale religious gatherings and pilgrimages.

Consecrated on March 25, 1958, by the future Pope John XXIII, the basilica was built to mark the centenary of the Marian Apparitions. Its interior offers a serene atmosphere for reflection, decorated with 39 paintings depicting saints and blessed individuals, alongside 52 intricate gemmaux decorative elements that catch the light. Visitors appreciate the sheer scale of the space, which provides shelter and a place for communal prayer regardless of the weather above.

For travelers planning a visit in 2026, the basilica operates on a seasonal schedule. From April 4 to November 1, it is open daily from 06:00 to 20:00, allowing early morning or late evening visits. During the winter months, from November 2 to December 31, hours are adjusted to 08:00 to 18:00. The site is situated at an elevation of 420 meters, offering a distinct perspective of the town. While specific admission fees are not listed, the basilica remains a central hub for spiritual and historical exploration in Lourdes. Travelers can contact the site at +33-5-62427878 for further logistical inquiries. This underground church remains a vital component of the Lourdes experience, blending modern engineering with deep Catholic tradition.