Trøgstad Fort, Military fortification in Indre Østfold, Norway
The fortress extends underground with 1.3 kilometers of tunnels, 500 meters of trenches, and includes two main artillery batteries for defense operations.
Constructed in 1917 as part of the Fossum fortress system, Trøgstad Fort maintained active military operations until its final decommissioning in January 1997.
The site currently operates as a museum where former military personnel conduct tours, sharing their experiences and knowledge of Norwegian defense systems.
Access to the fort requires advance arrangements through Trøgstad Forts Venner organization, with vehicle entry restricted between 19:00 and 07:00 at Gravstjern gate.
Trøgstad Fort holds the record for the longest operational defense system in Norway, functioning continuously from 1917 until the Nike missile system closure in 1990.
Location: Indre Østfold Municipality
GPS coordinates: 59.63389,11.34139
Latest update: March 8, 2025 14:16
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