The Holy Trinity Church in Kollmann was previously called the customs chapel and was connected to the customs office by a wooden walkway. The church itself was built around 1588 and nearly destroyed by a fire in 1938. In the meantime, it has been renovated. It is open from 8 a.m. to 7 p.m. Holy Mass: Sunday at 8:30 clock or 10:00 clock (german)