The Altenbeken–Kreiensen railway is part of a former long-distance route in Germany from the Ruhr area via Altenbeken, Ottbergen, Holzminden, Kreiensen and Seesen towards Berlin.
Brakel lies at the crossroads of Federal Highways (Bundesstraßen) B 64 (Münster-Paderborn-Brakel-Seesen-Halle-Leipzig) and B 252 (Blomberg-Brakel-Korbach-Marburg).
In the years that followed the Derneburg–Seesen railway from Derneburg – which again ran southwards – reached Bockenem in the Nette valley on 27 May 1887, Groß Rhüden on 1 October 1887 and finally the railway hub of Seesen on 1 May 1889.
From Seesen on the northwestern edge of the Harz near the A 7 motorway it runs through the Upper Harz past Clausthal-Zellerfeld, the High Harz, where it is combined for several kilometres with the B 4, past Braunlage and then through the eastern Harz foothills into Mansfelder Land.
The metalled artificial road (Chaussee) between Seesen and Osterode was built between 1785 and 1795 as an extension of the Frankfurt Road and known as the Thuringian Road (Thüringer Straße).
In the Middle Ages, it served as a trade node on the east-west road between Einbeck and Osterode and the north-south road from Northeim to Seesen.
Developing a belief in egalitarian and religious pluralism in education, he established (1801) in Seesen, near the Harz Mountains, a school in which forty children of Jewish parents and twenty children of Christian parents were to be educated together, receiving free board and lodging.
Seesen and Gandersheim were separated from Brunswick-Göttingen and attached to Henry's part of Brunswick-Wolfenbüttel.
Since 1990 Thale has had a town partnership with Seesen (Lower Saxony) on the northwest edge of the Harz and, since 1998, with the French town of Juvisy-sur-Orge, 18 km from Paris, as well as Tillabéri in Niger, northwest of the River Niger.
After they reached majority, they divided the territory among each other in 1291: William received the northern part of their father's state, including Brunswick, Schöningen, the Harzburg, Seesen, and Königslutter.