The chapel is built upon a volcanic rock remnant that rises abruptly from the sea.
The staircase was carved into the rock by hand to replace an earlier, more dangerous path used by locals.
The interior chapel space is physically small, typically accommodating only a few worshippers at a time.
The site is known locally as 'Kastri' due to the ruins of an ancient castle that once stood atop the summit.
During the Mamma Mia! filming, the interior wedding scenes were shot on a soundstage in the UK, while the exterior was filmed on-site.
The Chapel of St. John (Agios Ioannis sto Kastri) is a Greek Orthodox church perched on a sheer rocky outcrop 100 meters above the Aegean Sea on the island of Skopelos. The site is accessible only by climbing a steep stone staircase of approximately 200 steps carved directly into the rock face. The original structure dates back to the 18th century, though archaeological evidence suggests the site has been used for religious purposes since antiquity. It gained international recognition as the filming location for the wedding scene in the 2008 film Mamma Mia!. The interior is sparse, featuring traditional Byzantine-style iconography and votive offerings. Due to its isolated location, the chapel offers panoramic views of the Skopelos coastline and the neighboring island of Alonissos. The rock formation is detached from the main landmass by a narrow chasm, bridged by the winding staircase. It remains an active religious site, hosting traditional panigiri festivals on the saint's feast day.
The landing midway up the stairs provides the iconic profile view of the chapel against the sea.
Wear athletic footwear with good grip, as the stone steps can be uneven and slippery.
Bring a bottle of water, as there are no amenities on the summit of the rock.
Visit on a windy day with caution, as the open staircase lacks handrails in many sections.
Avoid visiting during extreme high-wind conditions when the staircase becomes hazardous.
Shoulders and knees must be covered; modest dress is required for entry into the chapel interior.
