Kronenburg Castle, Medieval castle ruin in Dahlem, Germany.

Kronenburg Castle is a medieval fortified structure located on a rocky outcrop in the Upper Kyll Valley, with remaining walls that demonstrate how defensive positions were built. The preserved structures allow visitors to understand the layout and construction methods of the time.

The castle first appears in written records from 1277, documented in a charter confirming its existence as a fortified site. It functioned as a seat of local power for centuries before losing its importance at the end of the 18th century.

The ruins display medieval construction methods typical of the Eifel region, with masonry and towers still visible today. The site reflects how people organized their settlements and defenses during that era.

Access to the ruins is always possible since it is an open-air monument with no enclosed areas or restricted sections. Wearing sturdy footwear is recommended, as the ground is uneven and caution should be used around the remaining walls.

The parish church of St. Johann Baptist, also called Johanniterkirche, had a church tower that doubled as an additional defensive tower for the castle complex. Between 1921 and 1926, amateur actors from Kronenburg performed Tellspiele (plays about William Tell) on the ruin.