Borum Eshøj was once one of the country’s largest barrows. In it, three Bronze Age graves were found dating back to about 1350 BC. The bodies lay in their coffins of hollowed out oak tree trunks in graves that are among the most important prehistoric finds. The oak coffin graves were excavated in the 1870s and are now on show at the National Museum of Denmark. The areas once had more than 40 barrows but most have now gone. The remains of Borum Eshøj are still visible
Noctilucent Clouds
The Golden Hour 
I did not know about these. Thank you!