The San Miguel de Arretxinaga chapel, located in the town of Markina-Xemein, Bizkaia, is a unique architectural and cultural site. Built in the 18th century, the chapel is renowned for its distinctive interior, featuring an extraordinary arrangement of three large rocks that form a natural altar.

These naturally occurring limestone boulders are positioned in such a way that they form a kind of chamber, with the central rock serving as the focal point. This unusual geological phenomenon has long been associated with spiritual and mystical significance, making the chapel a site of pilgrimage and local legend.

According to popular legend, any young man who wishes to wed within the year must perform a peculiar ritual: crawling beneath the rocks three times. It’s a custom that has been passed down through generations, adding a touch of magic to this geological wonder.

The Miguel de Arretxinaga chapel is a point of interest for those intrigued by the interplay between nature and spirituality. Its unique blend of natural and architectural elements offers a serene and contemplative atmosphere, making it a must-visit destination in the Basque Country.