Oktogon is a station of the yellow M1 (Millennium Underground) line of the Budapest Metro under Oktogon. The station is located at the junction of Budapest's Grand Boulevard (Nagykörút) and Andrássy Avenue (Andrássy út). It was opened on 2 May 1896 as part of the inaugural section of the Budapest Metro, between Vörösmarty tér and Széchenyi fürdő. This section, known as the Millennium Underground Railway, was the first mostro system in continental Europe. In 2002, it was included into the World Heritage Site "Budapest, including the Banks of the Danube, the Buda Castle Quarter and Andrássy Avenue".
Construction of the Millennium Underground at Oktogon (1896)