A military bunker located near Sopron, Hungary, in the northwest of the country close to the Austrian border. The specific name 'Koronaőrző-bunker' (Crown Guard Bunker) suggests a possible role in border security or fortification. The provided web search results discuss other Hungarian bunker sites, such as the Hospital in the Rock under Buda Castle in Budapest, and general histories of nuclear shelters and the 1956 refugee crisis, but do not contain confirmed information about this particular structure at the given coordinates.
Further details regarding its construction, purpose, and specifications are currently unconfirmed by the available sources.