Dattenberg Castle

According to the owner, the entrance gate is often open and exploration is permitted.
It is planned to make the castle usable for weddings as well.About history:
Already at the beginning of the 13th century. Landlords belonging to the knighthood had their seat on Dattenberg. Around 1320 the castle and the court located there became a fiefdom of the Electorate of Cologne.
Of the small castle complex, only the keep, which is greatly reduced in height, remains of the walled ring fortifications and a neck ditch broken into the slate have survived.
After the fall of Kurköln, the Prussian state sold the former fiefdom to wealthy private individuals, including the Cologne notary Josef Stoppenbach. In 1840, Stoppenbach built a country house with adjacent economic buildings on the site. In 1850 Baron von Mengershausen took over the property, followed in 1887 by the Berlin master builder Adolf Fuchs, who, in homage to the zeitgeist, gave the Stoppenbach country house the look it is today.
In 1949 the Cologne district acquired the property and used it for more than four decades as a place for recreation, meeting and education for young people at home and abroad.
Dattenberg Castle has been privately owned since 2003.

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"... Confirmed references to the small castle Dattenberg appear for the first time at the beginning of the 14th century, when a Wilhelm von Dattenberg sold the castle to the Archbishop of Cologne between 1306 and 1331. From the medieval fortifications that were built after the end of the 17th century The round donjon and a surrounding wall with a flanking tower have been preserved. Today the complex is dominated by a castle-like villa with two differently designed towers that can be seen from afar. The Berlin builder Adolf Fuchs, who acquired the property in 1887, let in Extending the existing country house there to the representative building around 1890. Since the 1920s, the buildings have seen several changes of ownership and different uses: initially a Catholic girls' home, from 1939 it served as a regional year camp and was plundered in the last days of the Second World War Cologne and from 1975 the Rhein-Erftkreis as de The successor here is a school camp, which was given up in 1996. Since then, the facility has been privately owned again. ... "
romantischer-rhein.de/a-burg-dattenbergalleburgen.de/bd.php?id=25133
der-rheinreisen.de/sagenhaben-familiengeschichten/burgen-schloesser-am-romantischen-rhein-heute-burg-dattenberg

Confirmed references to Dattenberg Castle first appear at the beginning of the 14th century, when Wilhelm von Dattenberg sold the castle to the Archbishop of Cologne between 1306 and 1331. The round keep and an enclosing wall with a flanking tower have been preserved from the medieval fortifications, which became ruins in an unknown manner after the end of the 17th century.The complex is now dominated by a castle-like villa with two differently designed towers that can be seen from afar. The Berlin master builder Adolf Fuchs, who acquired the property in 1887, had the existing country house expanded into a representative building in 1890. After 1920, the buildings experienced several changes of ownership and different uses: initially cath. It served as a country year camp from 1939 and was plundered at the end of World War II. Today the facility is privately owned.