The arch was built in 1810 to celebrate the king's jubilee
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Damage to a 200-year-old monument has forced highways chiefs in mid Wales to close the road running under it.
Hafod Arch in Devil's Bridge, near Aberystwyth, was built in 1810 by local squire Thomas Johnes to commemorate George III's golden jubilee.
It is thought a lorry struck the arch earlier this week and diversions are now in place on the B4574 road.
Ceredigion Council said it was unsafe for pedestrians or vehicles to walk or travel underneath the stone arch.
A council spokeswoman said the B4574 road from Devil's Bridge to Cwmystwyth would be closed until repairs had been carried out.
"The Cwmystwyth stone arch which crosses the road has suffered damage and is deemed to be unsafe for both vehicles and pedestrians travelling on the road under the arch."