The settlement officially gained town status in 1525. After the town had been recognized as a health resort by the government in 1905 the name was changed to "Bad Sachsa" with "Bad" meaning spa.
Bad Sachsa is known for being the town where Berthold Maria Schenk Graf von Stauffenberg and his four siblings were sent by the Nazis in 1944, following the failed 20 July plot.
The dam was built in 1931 and has a capacity of 25.5 million m³.
The Harzwasserwerke water company pipes drinking water as far away as Bremen.
It is in the forest near a railway track which must not be crossed by pedestrians.
Osterode is located on the German Timber-Frame Road.
The Söse river flows through the town from the Söse Dam lake about 5 km upstream.
Osterode is the starting point of the 100 km long Harzer Hexenstieg, a hiking trail to Thale.
The B 243 federal route, built as a divided highway, is the main western link between the northern and southern Harz area. Osterode lies on the Herzberg–Seesen railway, with services to Brunswick.Two inhabitants of the village Nienstedt am Harz, 2 km north of the cave, have the same rare DNA pattern as that found in the skeletal material of a man whose bones were found in the Lichtenstein Cave dating to about 1000 BC.