The classical portal
A columned entrance facing the Chain Bridge head on, its dimensions deliberately matched to the bridge.
Fred Romero from Paris, France — CC BY 2.0 · Mike is Michi — CC BY-SA 4.0 · Nelson Pérez — CC BY-SA 3.0 · kallerna — CC BY-SA 4.0
Frankly, no. It is a road, not a site. But its portal is worth a minute while you are at Clark Ádám tér, and walking through is practically useful if you are heading west. Do not plan it as a stop.
An old Hungarian line: since the tunnel's dimensions match the Chain Bridge exactly, it was said in jest that it was built so the bridge could be slid inside when it rained. Not true, of course, but told to visitors for a century and a half.
A Scottish engineer who supervised the construction of the Chain Bridge and then drove this tunnel. He was no relation to William Tierney Clark, the bridge's designer, despite the shared name. The square at the bridge end carries his name today.
If time allows, walking over the hill through the Castle District is far pleasanter than passing under it: you come out at the Vienna Gate and descend to Széll Kálmán tér. The tunnel is for speed, the hill for the view.
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The Buda Castle Tunnel runs through Castle Hill from Clark Ádám tér at the Chain Bridge end to the western side of the hill, about 350 metres long. It was cut between 1853 and 1857 under the Scottish engineer Adam Clark — the same man who supervised the building of the Chain Bridge — and was completed a few years after the bridge to finish the route: the bridge crosses the river, the tunnel crosses the hill. Its width and height were deliberately matched to the bridge's dimensions, so that the tunnel reads as a direct continuation of it. Its eastern portal is a classical front of columns facing the bridge head on. The Hungarian joke attached to it is well known: when the tunnel was finished, some said it had been built so the bridge could be pushed inside when it rained. It is an old line, still told to visitors. The tunnel today is an ordinary road with a pedestrian pavement, and it is not visited as a sight in its own right — but walking through is free, takes five minutes, and is the shortest route from the Chain Bridge end to the western side of the hill and Széll Kálmán tér. Treat it as a practical link with a handsome portal, not a tourist stop.
A columned entrance facing the Chain Bridge head on, its dimensions deliberately matched to the bridge.
Stand at the portal and look east: tunnel and bridge on one line, crossing hill and river together.
At its portal: the Zero Kilometre Stone, the funicular station and the Chain Bridge end all in one place.
The same engineer who supervised the Chain Bridge — bridge and tunnel are one project in two stages.
Clark Ádám tér, under Castle Hill, Buda 1013