It is not known exactly when the Tiefburg castle was built or by whom. It is assumed that it was built in the 12th century, possibly by the Abbey of Lorsch or the Count Palatinates of the Rhine (later known as the Prince Electors of the Palatinate), who set up residence in nearby Heidelberg around this time. It is also possible that the castle had its origins in a fortiied estate. The knights of Handschuhsheim who lived in the Tiefburg were initially unfree knights, known as ministeriales, in the service of the Abbey of Lorsch, and later on vassals of the Prince Electors of the Palatinate. The dynasty died out when the last knight of Handschuhsheim, Johannes (Hans) V., died aged 16 on 31st December 1600 from injuries sustained in a duel. Through inheritance, the Tiefburg became the property of the barons of Helmstatt (who became counts of Helmstatt in the 18th century).
Tiefburg was badly damaged in the Thirty Years‘ War. In 1689 it fell victim to the War of the Palatine Succession and became uninhabitable, whereupon the Helmstatts built a new residence in the immediate vicinity. The original gate of this new residence can still be seen to the east of the square in front of the Tiefburg. Count Raban von Helmstatt had the Tiefburg restored in the years 1910 to 1913.References:
Louisenlund is a site with one of Denmark's largest collection of megaliths. Some 50 stones standing upright among the trees, many of them over 2.5 metres high. The megaliths, which bear no inscription, stand on low mounds or over graves where the remains of burnt bones are buried. In the early Bronze Age and late Iron Age (1100 BC), it appears to have been common practice to set megaliths over graves of this kind. The stones stand alone or in small groups. As the site has not been archeologically investigated, it is not known why the stones were raised there. Another important megalithic site on Bornholm is Gryet, a small wooded area 5 kilometres west of Nexø. Originally it had more than 60 megaliths. Some have now been removed while half those remaining have fallen to the ground. The highest of them, once standing on the mound towards the south of the wood, was removed in the 17th century to be used as a gravestone. Louisenlund was bought by King Frederik VII when he visited Bornholm in 1851. He named it after his mistress, Countess Louise Danner.