As early as the 18th century, a chapel dedicated to the Holy Trinity stood on this site. It was originally built of slate rubble, and stones from the former Nordhalben Castle were likely also incorporated into the masonry. The Holy Trinity Chapel was deeply rooted in the hearts of the locals. After the Great Fire of Nordhalben on March 19, 1856, services were held at this site until the Marienkapelle and the parish church were rebuilt, as documented by the contemporary witness account of Andreas Stengel:
"The service interrupted by the fire was resumed on March 23, 1856, on Holy Easter, in the chapel of master miller Lorenz Murrmann of the Thomas Mill, "To the Holy Trinity," on the Mühlberg. A silent mass was held by the Reverend Father Stadter, where all the parishioners flocked and were once again able to pour out their hearts to God under God's open sky." The hymn "Be praised and highly exalted, Holy Trinity" was sung, and no eye was left without tears.
On July 14, 1945, the Trinity Chapel was destroyed in a tragic accident: A truck loaded with people, driving down the Mühlberg, failed its brakes and rammed into the chapel without stopping. The Kronach Road Construction Authority prohibited the rebuilding of the chapel at its original location due to the traffic hazard. Subsequently, the remains of the chapel were demolished, and the interior furnishings were lost. After the Mühlberg returned to the municipality in 1997, downgraded to a local road, the people of Nordhalben took the initiative to rebuild it. With the participation of Nordhalben and outside construction companies, who donated materials and labor free of charge, and through the work of volunteers, the reconstruction was successful. The people of Nordhalben celebrated with a "Tunnel Festival" on May 20. In 2004, the reconstruction of its Trinity Chapel began.
The interior:
The focal point is the crucified Jesus Christ. The body comes from the grave cross of Hagenauer, a forester's son, who died in an accident here on the Schlossberg in the early 1940s. The "Madonna of the Ground" from the destroyed, historic Trinity Chapel commemorates the martyrdom of the Son of God: "Ecce homo." God the Father and the Holy Spirit are symbolized by cloths (lacework and vestments from Nordhalben) depicting the "Eye of God" and the "tongues of fire" from the miracle of Pentecost.