The Budapest metro is one of the oldest underground railway systems in the world. The first line, the Millennium Underground Railway (M1), opened in 1896 and still runs beneath Andrássy Avenue, passing through stations that have preserved the atmosphere of the Austro-Hungarian era. Budapest did not build its metro at once, but in layers — from the elegance of M1 to the deeper socialist-era lines, each reflecting a different political and architectural era.
During the socialist years, the system also gained a quiet mythology — stories of unused tunnels, long corridors not shown on maps, and stations that felt strangely distant from the surface.
Over time, the Budapest metro became more than transport. It became a parallel city — structured, layered, and quietly moving beneath the surface of Budapest.