Herzberg, Mountain summit in Taunus, Germany.

Herzberg is a 591.4 m hill at Dornholzhausen in the Hochtaunus, the southeastern spur of the Kieshübel and Roßkopf. On its summit stands the 25 m Herzbergturm, a stone lookout modelled on a Roman watchtower, with a glazed observation deck above a square quartzite shaft. Dense conifers hide most of the shaft, leaving the dark deck and a small part of the upper tower visible against the sky.

In 1875 the Bad Homburg branch of the Frankfurt Taunus Club was founded to build a viewing platform on the summit, but money ran short and an 18 m wooden scaffold went up in 1878 instead. A separate Homburg Taunus Club under Georg Schmidt pushed for a stone tower from 1885, and Kaiser Wilhelm II personally signed the design with "Genehmigt" on 12 April 1910. Baurat Louis Jacobi modelled the tower on a Roman watchtower, citing the nearby Saalburg fort and the Limes; the foundation stone was laid on 20 July 1910 and the 25 m tower opened on 30 July 1911.

The name derives from the deer: originally Hirschberg, it became Hirzberg and then Herzberg. Since 1932 a mountain inn has stood on the summit, and the tower's 50-cent admission goes to its landlord. The Bad Homburg Taunus Club, founded in 1885 under Georg Schmidt, built the tower.

Marked hiking trails lead to the summit and connect with the broader Taunus trail network for extended exploration. Parking areas are located nearby and provide easy access to the trailhead.

The tower's design came from a rejected first draft: Kaiser Wilhelm II refused it because it made no reference to the nearby Saalburg fort and the Limes, so architect Louis Jacobi modelled the new tower on a Roman watchtower. It was built from Taunus quartzite boulders, with a wooden roof structure of Taunus oak.