Calenberg

Calenberg Castle (German: Burg Calenberg, later called Schloss Calenberg and Feste Calenberg; ruins known as Alt Calenberg) was a medieval lowland castle in central Germany, near Schulenburg in the borough of Pattensen, 13 km west of the city of Hildesheim. It was built as a water castle in 1292 by the Welf duke, Otto the Strict, in der Leine river meadows between 2 branches of the Leine river on the southern part of the chalk marl hill of the Calenberg. At the start of the 16th century it was converted into a fort (Feste). In the 15th century, Fort Calenberg gave its name to the Welf Principality of Calenberg. Following the Thirty Years' War it lost its military importance and was slighted. Today it is a ruin with underground vaults that are surrounded by high ramparts.

Nordstemmen station is located on the Hanover–Göttingen railway and the Hildesheim–Löhne railway in the town of Nordstemmen in the German state of Lower Saxony. The station building was built by Conrad Wilhelm Hase (1853–1854), but it has not been used by Deutsche Bundesbahn or Deutsche Bahn since 1977. Since 2011, the Hildesheim contractor Dirk Bettels has tried in vain to acquire and rehabilitate the grade II heritage-listed station building with public funds. Construction work begun by Dirk Bettels was discontinued at the end of March 2013 because no contract had been signed by Deutsche Bahn.

Marienburg Castle is a Gothic revival castle in Lower Saxony, Germany. It is located 15 kilometres (9.3 mi) north-west of Hildesheim, and around 30 kilometres (19 mi) south of Hannover, in the municipality of Pattensen, Hannover. It was also a summer residence of the House of Welf whose flag (in the colours of yellow and white) flies on the main tower.

Nordstemmen is a village and a municipality in the district of Hildesheim, in Lower Saxony, Germany. It is situated on the river Leine, approx. 10 km west of Hildesheim, and 25 km south of Hannover.

Haller is a river of Lower Saxony, Germany. It flows into the Leine near Nordstemmen.

GEO600 is a gravitational wave detector located near Sarstedt, a town 20 km to the south of Hanover, Germany. It is designed and operated by scientists from the Max Planck Institute for Gravitational Physics, Max Planck Institute of Quantum Optics and the Leibniz Universität Hannover, along with University of Glasgow, University of Birmingham and Cardiff University in the United Kingdom, and is funded by the Max Planck Society and the Science and Technology Facilities Council (STFC). GEO600 is capable of detecting gravitational waves in the frequency range 50 Hz to 1.5 kHz, and is part of a worldwide network of gravitational wave detectors. This instrument, and its sister interferometric detectors, when operational, are some of the most sensitive gravitational wave detectors ever designed. They are designed to detect relative changes in distance of the order of 10−21, about the size of a single atom compared to the distance from the Sun to the Earth. Construction on the project began in 1995.In March 2020 the COVID-19 pandemic forced the suspension of operation of other gravitational wave observatories such as LIGO and Virgo (and in April 2020, KAGRA) but GEO600 continued operations.As of 2023, GEO600 is active in its gravitational wave observation operations.

The Innerste is a river in Lower Saxony, Germany. It is a right tributary of the Leine river and 101 km (63 mi) in length.

Sarstedt (German: Bahnhof Sarstedt) is a railway station located in Sarstedt, Germany. The station is located on the Hanoverian Southern Railway. The train services are operated by Deutsche Bahn, Metronom and Erixx. The station is also served by the Hanover S-Bahn.

Emmerke is a part of the municipality of Giesen in the district of Hildesheim, Lower Saxony, in north-western Germany.

Pattensen (German: [ˈpatn̩zn̩] ) is a town in the district of Hanover, in Lower Saxony, Germany. It is situated approximately 12 km (7 mi) south of Hanover.

Sarstedt is a town in the district of Hildesheim, Lower Saxony, Germany. It has approximately 18,500 inhabitants. Sarstedt is situated 20 km south of Hanover and 10 km north of Hildesheim. Sarstedt station is on the Hanoverian Southern Railway and is served by the Hanover S-Bahn. The GEO 600 gravitational wave detector is located nearby. The former independent municipality Giften has been a part of Sarstedt since 1 March 1974.

Saale is a river of Lower Saxony, Germany. It is a left tributary of the Leine. Its source is near the village Duingen. It flows into the Leine in Elze.