Teufelsfels Observation Tower, Stone observation tower in Hennweiler, Germany.

Teufelsfels is a stone observation tower located in Hennweiler that rises to approximately 14 meters. The observation deck at the top offers views in all directions across the mountains, valleys, and forests of the Hunsrück region.

Until the 1960s the Teufelsfels could be climbed by an anchored iron ladder; weathering made this impossible from 1975, so Hennweiler considered a tower. The stone tower was built in 1984/85 on the initiative of mayor Heinrich Heimfahrt, which earned it the nickname "Langer Heinrich".

The tower's nickname, "Langer Heinrich" (Long Henry), honours mayor Heinrich Heimfahrt, who pushed through its construction in 1984/85. The quartzite crag below it is a protected natural monument, one of four large quartzite outcrops on the Lützelsoon ridge, and until the 1960s could be climbed by an anchored iron ladder.

The tower is reachable via several hiking trails starting from nearby villages like Bruschied. Wear sturdy shoes and bring a jacket, as weather can change quickly at this elevation.

The tower is nicknamed "Langer Heinrich" after Heinrich Heimfahrt, the mayor of Hennweiler who pushed through its construction in 1984/85. Until the 1960s the quartzite rock itself could be climbed on an anchored iron ladder; weathering forced its closure from 1975, which led to the stone tower.