Bridges along the eastern border of West Germany were at least be built to be rigged with explosives too. What looked like drain covers were actually the lids of the explosive chambers. For pictures see [1] (article is in German).
Regarding Switzerland, there is this absurdly high production value propaganda Triptych-Cinerama-short produced for the 64 swiss national expo.
Fortress of Peace (Wehrhafte Schweiz / La Suisse vigilante / La Svizzera vigilante) with countermobility action all over the place and prominently in this section:
[1] http://www.sperranlagen.de/bruecken.htm