Built in 1392, it is the city's landmark and the historic entrance from the east.
The place was first mentioned as the royal court “Cagenberg” in the year 1000. In 1281 it received city rights and from 1365 to 1380 it was surrounded by a 1000 meter long city wall and 13 towers. Even though there wasn't a large facility here like at the Untertor, the gate was good with its pointed arch passage to the outside with a drop gate and to the inside with a swing gate
secured. This is evidenced by the guides for the trapdoor, as well as recesses in the masonry for strong beams that served as bars. With the half-timbered floor for the tower keeper, a steep hipped roof and the bell tower, the 33 meter high tower got its current appearance in 1630.
Since 1981 it has been accessible to the tower keeper's apartment via 133 steps from the Hohenfeld chapel.
The city and tower museum shows various exhibitions on the city's history on four floors. On the third floor, the topic of wood and especially that used for half-timbering is illustrated with models and a carpenter on the roller. The fourth floor offers a beautiful view over the city to the Taunus.