Bismarck Tower, Bismarck tower in Sargenroth, Germany

Bismarck Tower is a 17.5-metre observation tower on a square plan, built of greywacke rubble masonry with black slate courses and three-quarter columns at the corners. It stands just outside Sargenroth between the Simmerbach valley and the Soonwald. Trees planted in 1902 now largely block the view from the platform.

A committee of Bismarck supporters, including district administrator Gustav Adolf von Beckerath, formed in 1899 and chose Wilhelm Kreis's Götterdämmerung design. The foundation stone was laid on 24 June 1900; builder Peter Weirich supervised work using greywacke from a Soonwald quarry. The planned height was raised from 12 to 17.5 metres, and a lottery raised 6,000 marks to finish it. The tower was inaugurated on 31 August 1902, costing 13,300 marks in total.

The site was chosen partly because it was an old assembly and court place (Thingstätte), near the historic Nunkirche. Since 2011, the Tower in Concert event has been held on the tower steps on the fourth Saturday of August.

The tower is open daily, but the view is now largely blocked by trees planted in 1902 that have since grown tall. A new staircase was installed inside and railings added to the outer steps at the entrance before the 2002 centenary. The tower stands right at the edge of Sargenroth on a hill between the Simmerbach valley and the Soonwald.

The tower's viewing platform was first used for a fire on the evening of its inauguration, 31 August 1902. Since 2011, the event Tower in Concert has been held on the tower steps on the fourth Saturday of August. The trees planted in 1902 now largely block the view.