Decoy Control Bunker (Gg3)

Tucked into the Argyll countryside near Helensburgh, this Second World War decoy control bunker feels properly forgotten - which is exactly why it's worth seeking out. The concrete structure sits half-hidden, a stark reminder of how Britain defended itself against German bombers. Inside, you can still make out the control room layout where operators once managed decoy fires meant to draw enemy aircraft away from real targets. It's unglamorous and unpolished, which makes it all the more affecting than a sanitised museum display.

This is primarily for military history enthusiasts rather than casual day-trippers. Kids under ten will lose interest quickly - there's not much hands-on stuff, and the bunker's cramped interiors aren't built for entertainment. But if you're the type who reads wartime memoirs or plans routes around surviving defences, this is exactly your sort of pilgrimage. Allow twenty minutes to half an hour, depending on how deep you want to dig into the technical details and history.

The real appeal is context. It's best visited as part of a broader Argyll exploration rather than a standalone stop. Rosneath Castle Caravan Park sits just five miles away, making it an easy morning excursion before heading elsewhere. The landscape around Helensburgh itself rewards wandering - take a proper walk before or after, and the bunker becomes a worthwhile footnote to an otherwise good day out. Free access and no fussy opening hours mean you can turn up when you want.