The hike begins at the Altenburg Church above Kaltern. From there, a narrow but well-maintained forest path with a gentle incline leads first to a viewpoint offering a magnificent view over the Adige Valley. The trail is varied and winds through shady mixed forest – a head for heights is recommended in some sections.
At the viewpoint, turn left onto the St. Peter Trail and follow trail marker No. 2. The path descends in switchbacks through a small gorge. Before long, you'll reach the ruins of the three-nave church of St. Peter, an important relic of early Christian architecture. It is considered possibly the oldest church in Tyrol and is said to have been founded in the 6th century by Saint Vigilius of Trento. The remaining wall paintings by Thomas Egnolt from around 1400 are only fragmentary, but still worth a brief stop.
From the ruins, the trail continues to the suspension bridge – an exciting section of the tour with a fantastic view into the gorge. The path then climbs gently to a small hill. Soon you’ll reach the Rastenbach Gorge, where a turnoff leads into the gorge and the trail continues uphill. Good footwear is essential here, as the walkways can be damp and slippery in places.
At the upper end of the gorge, you reach the Müllereck, cross the road, and follow the trail on the left back toward Altenburg. The path winds leisurely through meadows and forest, returning to the Altenburg Church – the starting point of this circular hike.