History
Luxembourg grew around a rocky promontory above the deep gorges of the Alzette and Pétrusse, where a fortress was founded in 963. Successive powers — Burgundians, Spanish and Austrian Habsburgs, France, and Prussia — fought over and rebuilt it into one of the strongest fortifications in Europe, the "Gibraltar of the North."
The 1815 Congress of Vienna made Luxembourg a grand duchy in personal union with the Netherlands and a member of the German Confederation. The 1867 Treaty of London guaranteed its independence and neutrality and required the great powers to demolish the fortress; the surviving casemates — kilometres of tunnels bored into the rock — and the ramparts are now a UNESCO World Heritage Site. The crowns of Luxembourg and the Netherlands separated in 1890.
Germany occupied Luxembourg in both world wars, ending its neutrality and turning it into an enthusiastic founder of European integration. It is a founding member of the EU and hosts several EU institutions, including the Court of Justice and the European Investment Bank. The economy, built first on iron and steel, pivoted to finance from the late twentieth century and is now one of the world's largest investment-fund centres.
- Luxembourg: The Fortress That Became a Crossroads — A castle on a rock in 963 that grew into a county, a European dynasty, one of the strongest fortresses on the continent — halved in 1839, occupied in both world wars, and now a financial and EU capital
