Brunkeberg Tunnel
The 517th longest tunnel in the world
The Brunkeberg Tunnel (Swedish: Brunkebergstunneln) is a 231 m (758 ft)-long tunnel for pedestrians and cyclists connecting David Bagares Street to Tunnelgatan in central Stockholm. It passes through the esker Brunkebergsåsen and was inaugurated King Oscar II on 9 June 1886. After opening, many Stockholmers continued using the above-ground road because it cost two öre to access the tunnel.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).