Lettenbergbunkers are four World War I concrete bunkers built by British soldiers in spring 1917 in the Lettenberg, an extension of Kemmelberg in Kemmel, Belgium, originally serving as entrances to an underground command center that is no longer accessible. The shelters fell into German hands in April 1918, with one structure repurposed as a medical facility, identifiable today by a red cross marking. The site remains freely accessible daily via walking paths through the Heuvelland region, with one bunker now serving as a bat habitat, offering visitors a tangible connection to the area's World War I heritage. Managed by local tourism (toerisme@heuvelland.be), the bunkers integrate into regional hiking trails providing exploration of this significant military landscape.