Harmanec Tunnel
The 224th longest tunnel in the world
The Harmanec Tunnel (Slovak: Čremošniansky tunel) is a railway tunnel on the Banská Bystrica — Dolná Štubňa railway. It is 4,698 m (15, 413 ft) long and it is the longest railway tunnel in Slovakia. It was built from 1936 to 1940.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).