The Vertical Earth Kilometer

7000 Oaks – City Forestation Instead of City Administration (German: 7000 Eichen – Stadtverwaldung statt Stadtverwaltung) is a work of land art by the German artist Joseph Beuys. It was first publicly presented in 1982 at documenta 7.

The Fridericianum is a museum in Kassel, Germany. Built in 1779, it is one of the oldest public museums in Europe. Since 1955 the quinquennial art festival documenta has been centred on the site, with some artworks displayed on Friedrichsplatz, in front of the building.The exhibition building itself was fully renovated by 1982. Ever since 1988, Fridericianum has continually hosted changing exhibitions of contemporary art. Since June 2013 Susanne Pfeffer has been director of the Fridericianum.

Documenta (often stylized documenta) is an exhibition of contemporary art which takes place every five years in Kassel, Germany. Documenta was founded by artist, teacher and curator Arnold Bode in 1955 as part of the Bundesgartenschau (Federal Horticultural Show) which took place in Kassel at that time. It was an attempt to bring Germany up to speed with modern art, both banishing and repressing the cultural darkness of Nazism. This first Documenta featured many artists who are generally considered to have had a significant influence on modern art (such as Picasso and Kandinsky). The more recent editions of the event feature artists based across the world, but much of the art is site-specific. Every Documenta is limited to 100 days of exhibition, which is why it is often referred to as the "museum of 100 days". Documenta is not a selling exhibition.

The Ottoneum in Kassel, Germany was the first theater building built in Germany and is now a museum of natural history.

The Karlskirche in Kassel (also Oberneustädter Kirche) is a Protestant church built by Paul du Ry in 1710 for the local Huguenot community.The church was the location of a hundred-day sound installation by John Cage in 1987.

Kassel (German pronunciation: [ˈkasl̩] (listen); in Germany, spelled Cassel until 1926) is a city on the Fulda River in northern Hesse, Germany. It is the administrative seat of the Regierungsbezirk Kassel and the district of the same name and had 201,048 inhabitants in December 2020. The former capital of the state of Hesse-Kassel has many palaces and parks, including the Bergpark Wilhelmshöhe, which is a UNESCO World Heritage Site. Kassel is also known for the documenta exhibitions of contemporary art. Kassel has a public university with 25,000 students (2018) and a multicultural population (39% of the citizens in 2017 had a migration background).

The siege of Cassel took place between October and November 1762, when an allied force of Hanoverian, Hessian and British troops under the command of the Duke of Brunswick besieged and captured the French-held town of Cassel. It was the final engagement of the Seven Years' War in Western Europe, as the conflict was brought to an end by the Peace of Paris the following year. News of the town's capture arrived after the preliminaries of the peace treaty had been signed in Paris, so it did not have the dramatic impact that Brunswick had hoped for. It was acknowledged that the garrison's unexpectedly long resistance had allowed the French to negotiate from a much stronger position.

The Neue Galerie (New Gallery) is an art museum in Kassel in the state of Hesse, in Germany. The building was constructed between 1871 and 1877 as a museum for works of the Old Masters. The building was damaged and burned out on 22 October 1943 in a devastating air raid carried out on the orders of Winston Churchill. The 60 most important works were brought to Vienna, and were returned in 1956. The building and large parts of the collection were lost. The museum was reopened with its present name in 1976, and a large renovation was completed in 2011.

Bellevue Palace (German: Palais Bellevue or Schloss Bellevue) in Kassel was built in 1714 for Charles I, Landgrave of Hesse-Kassel. Originally the building served as an Observatory. It became a residence, and then part of Bellevue Castle, which was later destroyed. Until its closure for structural reasons in 2009, the building housed a museum devoted to the Grimm Brothers, which has now moved to the Grimmwelt Kassel.

The Bellevueschloss or Schloss Bellevue was a palace complex in Kassel, Germany, which served as a residence of the Electors of Hesse-Kassel. It was located on the Schöne Aussicht (English: Beautiful view), with view of the Karlsaue park. The building complex consisted of various 18th century palaces, which were combined at the start of the 19th century. In the 1930s, it housed the Landgrafenmuseum. For the most part, it was destroyed during the Second World War and not restored afterwards. With exception of the Bellevue Palace, nothing is left. Currently, the district court of Kassel stands on its location.

The Kingdom of Westphalia was a client state of France in present-day Germany, that existed from 1807 to 1813. While formally independent, it was ruled by Napoleon's brother Jérôme Bonaparte. It was named after Westphalia, but this was a misnomer since the kingdom had little territory in common with that area. The region mostly covered territory formerly known as Eastphalia. Napoleon imposed the first written modern constitution in Germany, a French-style central administration, and agricultural reform. The Kingdom liberated the serfs and gave everyone equal rights and the right to a jury trial. In 1808 the Kingdom passed Germany's first laws granting Jews equal rights, thereby providing a model for reform in the other German states. Westphalia seemed to be progressive in immediately enacting and enforcing the new reforms. The country was relatively poor but Napoleon demanded heavy taxes and payments and conscripted soldiers. Few of the men who marched into Russia with Napoleon in 1812 returned. The Kingdom was bankrupt by 1812. When Napoleon was retreating in the face of Allied advances in 1813, the Kingdom was overrun by the Allies and (in 1815) most of its territories became Prussian. Most of the reforms, however, remained in place.

The Battle of Kassel was a four-day struggle between the U.S. Army and the German Army in April 1945 for Kassel, a medium-sized city 140 kilometers northeast of Frankfurt am Main, which also is the second-largest city in Hesse (after Frankfurt). The battle resulted as the U.S. Third Army pushed northeast from the region of Frankfurt and Mainz. The battle opened on April 1, 1945 and ended with an American victory three days later. Opposing the Third Army's 80th Infantry Division were an infantry replacement battalion, some heavy tanks, and anti-aircraft guns. Although the Germans gave battle at Kassel, their army was on the brink of collapse as the Western Allies and the Red Army made deep inroads into Germany. The defense of Kassel did not materially impede the Allied advance, and, one month after the battle ended, Germany was forced to capitulate.