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Punkt Ø AS is a Norwegian art institution founded in 2006 with Østfold county as its largest shareholder. The institutions goal is to promote knowledge and understanding for Norwegian and international contemporary art. Punkt Ø runs Galleri F 15 and Momentum, a Nordic biennial for contemporary art.

Jeløy Radio (Norwegian: Jeløy radio) is a radio station situated on the peninsula of Jeløya in Moss Municipality in Østfold county, Norway. It currently only operates as an unstaffed coast radio station operating marine VHF radio connected to Tjøme Radio and a Navtex service operated from Vardø Vessel Traffic Service Centre.

Refsnes Gods is a hotel near the town of Moss, Norway, on the island of Jeløy. According to Frommer's 2005 travel guide, it is "the most elegant resort in the environs of Oslo". The building was originally constructed in 1767 as a pleasure pavilion. It contains a notable art collection. "Refsnes" stems from the Norwegian word "rif" (English: reef) due to a reef in the Oslofjord just outside the mansion. "Gods" means mansion in Norwegian. Since Gunn and Widar Salbuvik, took over ownership in 1998, many unique pieces of art have found a new home at Refsnes Gods. Every guest room and all the common areas have works of a dedicated artist displayed. More than 400 pieces from 90 well-known artists are represented, including Andy Warhol, Edvard Munch, Therese Nordtvedt, Carl Nesjar, Kjell Nupen, Håkon Bleken, Frans Widerberg, and Jacob Weidemann. Three works by Munch were stolen from the hotel in March 2005; they were shortly recovered, although one of the works was damaged during the robbery. The resort is also known for its wine cellar.

The Moss–Horten Ferry is an automobile ferry on Norwegian National Highway 19 that connects the counties of Vestfold and Østfold at the quays of Moss and Horten. The 10.5 kilometres (6.5 mi) crossing of Oslofjord is performed with three double-ended ferries operated by Bastø Fosen, making the crossing in 30 minutes, with departures twice an hour. In 2008 the line had a daily ridership of 3720 people and 4086 vehicles. It is the most trafficked car ferry line in Norway.

Gullholmen Lighthouse (Norwegian: Gullholmen fyr) is a coastal lighthouse in the municipality of Moss in Østfold, Norway. The lighthouse is located in the outer Oslofjord, off the island Jeløya. It was established in 1894, and replaced by a light in 1984.

German submarine U-1273 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 23 March 1942, and was laid down on 7 June 1943, at Bremer Vulkan-Vegesacker Werft, Bremen-Vegesack, as yard number 68. She was launched on 10 January 1944, and commissioned under the command of Oberleutnant zur See Karl-Heinz Voswinkel on 16 February 1944.

Bastøy Lighthouse (Norwegian: Bastøy fyr) is a coastal lighthouse in Horten Municipality in Vestfold county, Norway. It is located on the island of Bastøy in the Oslofjorden, about 4 kilometres (2.5 mi) southeast of the town of Horten. It was established in 1840 and originally consisted of a stone house with a low tower. It was replaced by an automated light in 1986.

Ytre Oslofjord (lit. 'Outer Oslofjord') is part of a fjord in eastern Norway. The Ytre Oslofjord is the outer part of the Oslofjord which is south of point where the Hurumlandet peninsula splits the fjord between the Drøbak Sound (the strait where the fjord narrows between Drøbak and Hurum) to the east and the Drammensfjorden to the west. North of this point, the Oslofjord is referred to as the Indre Oslofjord (inner Oslofjord). The Ytre Oslofjord stretches south to the Færder Lighthouse.

Bastøy Prison (Norwegian: Bastøy fengsel) is a low-security, male-only prison on Bastøy Island, Norway, located in the Horten municipality about 75 km south of Oslo. The prison is on a 2.6 km2 island and hosts 115 inmates making it the largest low-security prison in Norway. Arne Kvernvik-Nilsen, governor of the prison, leads a staff of 69 prison employees. Of this staff, only 5 employees remain on the island overnight. The prison is about one hour commuting distance from Oslo. Once a prison colony for young boys, the facility is trying to become "the first ecological prison in the world". Recidivism has been reported at 16%, compared to the European average of around 70%. Inmates are housed in wooden cottages and work the prison farm. During their free time, inmates have access to horseback riding, fishing, tennis, and cross-country skiing. The only access to the prison is from a ferry that departs from Horten.

Bastøy is an island in Horten Municipality in Vestfold county, Norway. The 2.23-square-kilometre (550-acre) island is owned by the government and it has no permanent residents, however, Bastøy Prison, a minimum-security prison, is located on the island, so there are always temporary residents on the island. The Bastøy Lighthouse was established on the island in 1840.

Tjøme Radio is a coast radio station in Horten, Norway. Operated by Telenor Maritim Radio, it has the responsibility for Skagerrak coast between Søgne and the Norway–Sweden border. It also covers the lake Mjøsa. Established in 1905 by the Royal Norwegian Navy, it became a civilian installation five years later. The station was located in Tjøme until 2008.

The Battle of Horten Harbour or the Action at Horten was an engagement that occurred on 9 April 1940. It took place during Operation Weserübung, when the Germans launched an amphibious assault on Karljohansvern, the Norwegian naval base at Horten. After being initially repulsed by Norwegian naval units, German troops headed overland to outflank the base, forcing it to capitulate.