Mil­len­ni­um Under­ground (Kisföl­dalat­ti vasút) is the first metro line in con­ti­nen­tal Europe and the sec­ond in the world. It was built in 1896 for the mil­len­ni­um anniver­sary of Hun­gary. The line was opened on May 2 by Emper­or Franz Joseph. Its con­struc­tion took only 21 months. In 2002, Mil­len­ni­um Under­ground and Andrássy út were rec­og­nized as a World Her­itage Site.