Lock 7 Viewing Centre is the easiest place in the St. Catharines area to understand the Welland Canal as a working piece of engineering rather than a line on the map. From the viewing area in Thorold you can watch lake freighters and ocean-going ships rise or drop through the lock, a slow and oddly absorbing process that makes the Niagara Escarpment feel very real.
There is a small interpretive centre and plenty of outdoor space, but the main attraction is timing your visit with ship traffic. It is a good low-key stop for families, canal enthusiasts, or anyone driving between Niagara Falls and St. Catharines who wants a practical look at how vessels bypass the falls.