Luxembourg City is one of the most surprising and least predictable capitals in Europe. Picture a city split by deep green gorges: up above, on a rocky promontory, the historic centre with its palaces, churches and squares; down below, along the Alzette and Pétrusse rivers, picturesque neighbourhoods of old houses and stone bridges. All of it wrapped in the remains of a colossal fortress, nicknamed for centuries 'the Gibraltar of the North', whose walls and tunnels carved into the rock earned it World Heritage status.
But Luxembourg isn't just a historic backdrop. It is also one of the capitals of the European Union (home to the Court of Justice and other institutions), one of the largest financial centres on the continent and a cosmopolitan city where dozens of nationalities live side by side and several languages are spoken. In the Kirchberg district, the glass towers of the banks and the European buildings sit alongside the cutting-edge architecture of the Mudam museum and the Philharmonie, while the old town keeps its medieval soul.
This guide explores the capital with a practical, warm eye: the Bock Casemates, the stunning Chemin de la Corniche ('the most beautiful balcony in Europe'), the Grand Ducal Palace, the cathedral, the Gëlle Fra, the Grund and Pfaffenthal valleys, and the museums and European quarter. And something you'll hardly find in any other capital: here public transport is completely free. Compact, green, elegant and surprisingly affordable to explore, Luxembourg is a city break almost nobody expects and almost everyone falls in love with.
The city was born in 963, when Count Siegfried acquired a rocky outcrop above the Alzette river, the Bock, and built a small castle there called Lucilinburhuc ('little fortress'), the origin of the name and of the entire country. Over a thousand years, that promontory became one of the most formidable fortresses in Europe, fought over and strengthened in turn by the Burgundians, Spanish, Austrians, French (Vauban) and Prussians, until it was nicknamed 'the Gibraltar of the North'. In 1867, the Treaty of London declared the country's neutrality and ordered much of the defences to be dismantled. Occupied by Germany in both world wars, Luxembourg was reborn afterwards as a prosperous Grand Duchy and as one of the founding capitals of a united Europe. All of this, from Siegfried's castle to European capital, is told on our history page.
Read the full history ↓The capital born in 963 on the Bock rock: a thousand years as a fortress, the underground casemates, the Grund district down below by the Alzette, and the Kirchberg plateau turned into a European capital.
Read the history of Luxembourg City and surroundings →A local guide tells you in half an hour what no sign at the site will ever explain. We look ours up on Civitatis: guided in Spanish and booked online with no fuss. They have 9 activities in Ciudad De Luxemburgo. And there are free tours here: you book without paying and tip the guide whatever you think at the end, so trying one costs you nothing. Have a look below: tap any of them to see them all.
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Origins, formation and what the sources say.
The whole history of Luxembourg (the city and the entire country) fits on a rocky outcrop above the River Alzette. In 963, a count of the Ardennes named Siegfried swapped some land with the Abbey of St. Maximin in Trier to get hold of a rocky promontory called the Bock. There, in a spot that was easy to defend and hard to take, he built a small fortified castle. Old documents call it 'Lucilinburhuc', which in the Germanic language of the time meant 'little fortress' or 'little castle'.
Both 'Luxembourg' and 'Lëtzebuerg', the Luxembourgish form, come from that name, Lucilinburhuc. In other words, the whole country is named after that tiny castle on the rock. A market, a church and a village slowly grew up around the fortress, all protected by its walls. The location was ideal: it sat where trade routes between the Latin and Germanic worlds crossed, high on a promontory ringed by natural ravines that served as a moat.
Siegfried's descendants became the Counts of Luxembourg, and over time the House of Luxembourg rose to the very top. In the 14th and 15th centuries several of its members became Holy Roman Emperors and Kings of Bohemia, among them Henry VII and the famous Charles IV. From a castle on a rock to the summit of imperial power in Europe: that is how Luxembourg's story began.
The same strategic position that gave birth to Luxembourg also doomed it to spend centuries as one of the most fought-over strongholds in Europe. It was so valuable militarily that the continent's great powers passed it from hand to hand, and each one strengthened and extended its defences. After the Counts and Dukes of Luxembourg, the city went to the Dukes of Burgundy in the 15th century and then to the Habsburgs: first the Spanish branch (the Spanish Netherlands) and later the Austrian one.
Every new owner added walls, bastions, forts and galleries. The Spanish fortified it in the 16th and 17th centuries. Louis XIV's French army took it in 1684, and the brilliant military engineer Vauban redesigned its defences, turning it into a state-of-the-art fortress. Then the Austrians came back and kept expanding it. The result was a colossal defensive system: three rings of fortifications, dozens of forts and, above all, the casemates. These were up to 23 kilometres of galleries, tunnels and gun ports cut into the rock, with room for thousands of soldiers along with cannons, workshops, kitchens and even horses.
Because it was almost impregnable, the city earned the nickname 'the Gibraltar of the North'. No other fortress on the continent came close. But all that military might came at a price. Luxembourg was a garrison town squeezed inside its walls, and its fate wasn't decided by the people who lived there. It was decided by the treaties and wars of the great powers that controlled it from far away.
Luxembourg's modern destiny was settled at the great diplomatic conferences of the 19th century. After Napoleon's fall, the Congress of Vienna in 1815 raised the territory to the rank of Grand Duchy and gave it to the King of the Netherlands in personal union. At the same time, though, it made Luxembourg part of the German Confederation and allowed Prussia to keep a garrison in the fortress. That left Luxembourg in an ambiguous position, caught between several worlds.
In 1839 the Treaty of London split the territory. Most of the French-speaking area (today's Belgian province of Luxembourg) went to Belgium. The rest, where people spoke Luxembourgish and German, stayed as the Grand Duchy we know today. This was the real birth of modern Luxembourg, with borders that were almost final.
The decisive step came in 1867. France wanted to annex the Grand Duchy, and its rivalry with Prussia nearly set off a European war (the so-called 'Luxembourg Crisis'). To head it off, the powers signed a new Treaty of London. It declared Luxembourg permanently neutral, ordered the Prussian garrison out and, most importantly, required the great fortress to be dismantled. Over the following years most of the walls, bastions and forts were torn down. Free at last from its military corset, the city could grow and breathe for the first time in a thousand years, opening up avenues and parks where cannons had once stood.
Neutrality wasn't enough to keep Luxembourg out of the wars of the 20th century. In August 1914, at the start of the First World War, the German army invaded and occupied the Grand Duchy in violation of its neutrality and kept it under military control until the war ended in 1918. The country regained its independence after the war. Over the following decades it consolidated its constitutional monarchy under the Nassau-Weilburg dynasty and Grand Duchess Charlotte.
The hardest blow came in the Second World War. In May 1940, Nazi Germany invaded Luxembourg again. This time it was more than a military occupation. The Nazi regime effectively annexed the country, banned French, imposed German and tried to 'Germanise' the population by force, even conscripting young Luxembourgers into the German army. The resistance was remarkable. In a 1941 census that asked people for their language and nationality, the overwhelming majority answered 'Luxembourgish', openly defying the occupiers. There were strikes, sabotage and harsh repression.
Grand Duchess Charlotte and the government went into exile and kept the country's voice alive from London. American troops liberated the capital in 1944, but the winter of 1944-45 still brought the Battle of the Bulge, the last major German offensive, which hit the north of the country hard. When the war ended, Luxembourg came out deeply scarred. Its national identity was stronger than ever, though, and it was clearly determined never again to stand alone against its neighbours.
The lesson of the two wars pushed Luxembourg to go all in on European integration. It was one of the six founding countries of the European Coal and Steel Community in 1951 and of the European Economic Community (the seed of today's European Union) in 1957. It did more than take part, too: it became one of the seats of the institutions. Luxembourg City is home to the Court of Justice of the European Union, the European Investment Bank, the Secretariat of the European Parliament, the Court of Auditors and other bodies, most of them on the modern Kirchberg plateau.
Meanwhile, the little Grand Duchy went through a spectacular economic transformation. It had been a steel-making country that depended on steel from the south. It reinvented itself as one of the world's largest financial centres, home to thousands of investment funds and international banks. Today Luxembourg has one of the highest per capita incomes on the planet. Its capital is a cosmopolitan city where nearly half the population is foreign and dozens of nationalities and languages cross paths every day. Close by, in the Moselle village of Schengen, the agreement that abolished internal borders across much of Europe was signed in 1985, another symbol of the country's role in building Europe.
In 1994 UNESCO recognised the outstanding value of the city's old quarters and fortifications by declaring them a World Heritage Site. So today the capital offers a unique contrast. On one side are the casemates and walls where the country was born in 963. Just a short walk away are the glass towers and cutting-edge architecture of one of the capitals of united Europe. Luxembourg has gone from Siegfried's 'little fortress' to the financial and institutional heart of the continent, turning its history as a fought-over stronghold into a calling as a bridge between the peoples of Europe.
