The Kettle Valley Railway needed to get through the Coquihalla Canyon, and the only way to do it was to drill five tunnels through the canyon walls while suspended above a river that cuts through some of the most unyielding granite in the Coast Mountains. The result is a 500-metre walk through tunnels and wooden bridges — you step through a cliff face, cross a bridge over the river gorge, enter another tunnel, emerge into daylight for a few seconds, and disappear into rock again. In summer the canyon stays cool; the tunnels are cold year-round, so bring a layer.
The full out-and-back through all five tunnels is about 4 kilometres and takes under two hours. The trailhead is in Coquihalla Canyon Provincial Park, a short drive from Hope's town centre. The path is paved and accessible for most of its length. Go early on summer weekends — it's well known, and the parking area fills by midmorning. In winter the bridges are removed and the tunnels close.