The Vyrnwy Aqueduct is one of the architectural landmarks of the ever-scenic Montgomery Canal. Like the canal itself, the Vyrnwy Aqueduct has had a troubled history. It collapsed during its initial construction in the 1790s, and had to be rebuilt.
The canal engineers were subsequently so worried by subsidence that they had to add iron bracing to the structure. None of this, though, should divert attention away from this magnificently attractive crossing of the River Vyrnwy. Easily viewed from the adjacent road (leave the A483 at Four Crosses, head west on the B4393, and turn right after a mile and a half), it is not presently navigable but will form part of the scheme to reopen the Montgomery to boats.
For a particularly attractive walk, park your car nearby and walk along the canal north to the nearby Carreghofa Locks, fully restored and one of the most picturesque spots on the Montgomery.