The Brother Klaus Field Chapel is a privately donated Roman Catholic chapel built between 2005 and 2007 above the village of Mechernich-Wachendorf in the Eifel region in Germany. The chapel was built according to plans by the Swiss architect Peter Zumthor. For the construction, a tent-shaped construction made of 112 spruce trunks was first erected. The chapel's body was made of tamped concrete around this inner structure, which was laid in 24 days by a volunteer tamping team, together with specialist craftsmen, in layers 50 cm high to a height of 12 meters, according to the region's traditional craftsmanship. A mott fire was maintained inside for three weeks in the fall of 2006, which charred the tree trunks and detached them from the concrete, making them easy to remove [Source: Wikipedia].