The Bock Casemates are a network of underground tunnels and fortifications located in Luxembourg City. Built in the 17th century, these casemates were designed to protect the city from invasions and served as a military stronghold. The extensive system includes over 23 kilometers of tunnels, showcasing impressive engineering and strategic military planning. Today, the Bock Casemates are a UNESCO World Heritage site, attracting visitors interested in history and architecture. The tunnels offer a glimpse into the past, highlighting the importance of Luxembourg as a fortified city in Europe. Guided tours provide insights into their historical significance and construction.