Geologically, the area belongs mainly to the Devonian and Culm formation in which slate, greywacke and diabase predominate.

In Wommelshausen stands a noteworthy old chapel of Romanesque origins that was apparently remodelled or renovated in the 13th century in the early Gothic style.

During renovation work, clues were found on the south side in the inner room to an earlier building.

This earlier building might have been a wooden church on a stone foundation, and might have been built in the time of the Irish-Scottish mission in the area.

Irish-Scottish missionaries were active in the vicinity even before Saint Boniface, as digs at the Büraburg Monastery prove (as do those at, among others, Wetter and the Christenberg).

The layman's entrance lies on the north side underneath the later enlarged window.

Measurements of the building's inner dimensions yield a width of about 6.95 m and a length of about 10.15 m. The walls are about 1.2 m thick.

It was supposedly a chapel to Saint Mary before the Reformation, and served as a pilgrimage site because of the spring, which was said to work wonders, and which was said to have come forth from under the choir.

Bad Endbach earns its livelihood overridingly from its spa business and tourism.