Adolf Kanonen

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Lonely Planet review

The formidable WWII weapon known as the Adolf Kanonen is the world's largest land-based big gun, with a calibre of 40.6cm and a recoil force of 635 tonnes. Because it lies in a military area, you're obliged to take a guided tour of the site and to have your own vehicle. Just turn up 10 minutes before departure. The bunker also contains a collection of artillery, military equipment and instruments used by Nazi coastal batteries during WWII.