Perched high above the Alzette River, the Bock Promontory in Luxembourg City is more than just a scenic viewpoint, it’s the very foundation of the nation’s capital. In 963 AD, Siegfried, Count of Ardenne, built his stronghold here, marking the origin of Luxembourg as a fortified city.
A Fortress With Centuries of History
What makes the Bock Promontory truly remarkable is what lies beneath it, the Bock Casemates, a 23-kilometer-long network of underground tunnels. Carved into the rock beneath the castle, these labyrinthine galleries once housed troops, artillery, kitchens, and workshops, providing both protection and military might.
These casemates were expanded over centuries, becoming part of one of Europe's most powerful fortresses. However, after the Treaty of London in 1867, Luxembourg was required to dismantle its fortifications. While most of the walls were demolished, parts of the Bock, including the casemates, were spared due to their integral position within the city’s foundations.
What to See & Do at the Bock Promontory?
- Explore the Bock Casemates: Wander through dimly-lit tunnels and imagine life for soldiers centuries ago.
- Take in panoramic views over the Grund and Alzette Valley from the top of the promontory.
- Visit Siegfried’s Castle ruins, where the foundations of Luxembourg began.
- Learn the history of the city through onsite information displays and guided tours.
Plan Your Visit
Location: Montée de Clausen, Luxembourg City, Luxembourg
Opening Hours: Typically open March–October (check local schedules)
Entry Fee: Modest admission fee for the Bock Casemates