A few kilometers away from the Trass caves in the Brohltal is the Laacher See volcano, which filled the surrounding valleys with lava particles up to 60 m high when it erupted 13,000 years ago.
The sources for the following outline of the Holocaust of the persecution of Jews in Lithuania can be found well and clearly documented in the links included.
The super moon as "Blue moon" appeared over Röttgen and Lichtenberg, districts of Hennef (Sieg) in North Rhine-Westphalia, only in a few cloud-free moments.
The Herrenhaus Oppenheim am Fühlinger See is an interesting Lost Place in the district of Cologne. It was built in the late 19th century next to a racecourse and is the source of all sorts of ghost stories.