Luxembourg

A tiny Grand Duchy in the heart of Europe: nationwide public transport is free, the fortress old town is World Heritage, and the Moselle wine country and the “Little Switzerland” gorges are the two best routes beyond the capital.

History: The city of Luxembourg began in 963 when Count Siegfried of Ardennes bought a rocky promontory called Lucilinburhuc (“little castle”), gradually developing into a county and then a duchy, and raised to a Grand Duchy after the Congress of Vienna in 1815 — still the world's only Grand Duchy. Luxembourg's old town and fortifications (Vieille ville et fortifications) were inscribed as World Heritage in 1994, and the Bock Casemates (Casemates du Bock) are remains of the “Gibraltar of the North” defence system. The official languages are Luxembourgish, French and German in parallel, with trilingual road signs and official documents common; the Moselle valley is a wine region, and the Müllerthal (Müllerthal) is called “Little Switzerland” for its sandstone gorges. Legend: A legend is told about the city of Luxembourg: the mermaid Melusine (Mélusine) was the wife of Count Siegfried, and after the truth was revealed she departed as a mermaid — this is a city legend and must not be taken as founding history. Another legend says the Bock Casemates tunnels lead straight under the Moselle; this too is legend, to be verified.

• Luxembourg old town and the Bock Casemates (Vieille ville / Casemates du Bock) — World Heritage, underground defences.
• Constitution Square and Notre-Dame Cathedral (Place de la Constitution / Cathédrale Notre-Dame) — the golden Madonna and city panorama.
• The Chemin de la Corniche (Chemin de la Corniche) — “Europe's most beautiful balcony”, overlooking the Pétrusse valley.
• Vianden Castle (Château de Vianden) — a medieval castle in the northern hills, reachable by cable car.
• Müllerthal “Little Switzerland” hiking (Müllerthal / Petite Suisse luxembourgeoise) — sandstone gorges, streams and forest trails.

Luxembourg's nationwide public transport has been free since 2020: domestic buses, trams and trains are free for everyone (including visitors), with no ticket purchase and no validation needed; cross-border sections (for example to border cities in France, Belgium or Germany) require a separate cross-border ticket, subject to official announcements. The airport is about 6–8 km from the centre; free buses 16 and 29 take about 20–30 minutes to the centre and central station, and tram T1 also connects the airport and centre (subject to official announcements); taxis to the centre cost about 30–35 euros, and Uber and Bolt do not operate locally. Luxembourg City old town has many slopes and steps — walking plus free public transport suffices; Vianden, Echternach and the Moselle wine country can be reached by free bus and train, rural services are fewer at weekends, and gorge hiking requires checking trail openings. Free does not mean unlimited: first-class carriages, cross-border sections and special services have separate rules, subject to official announcements.

• Red Line: Do not make a noise or climb in fortress casemates or memorial places; do not intrude on military areas or private winery restricted zones; do not use flash photography during church rituals.
• Taboo: Do not assume everyone speaks French and ignore Luxembourgish and German — greet first in French with Bonjour, then ask the other person's language; do not make loud phone calls in quiet residential areas or on public transport; do not refer to Luxembourg as part of France, Germany or Belgium.
• Good Manners: Shake hands or cheek-kiss on meeting (depending on the relationship; a handshake is best on first meeting); restaurant tips are not compulsory — rounding up or 5%–10% for good service; queue, and let passengers alight first.
• Pitfalls for visitors: ① Assuming free public transport also covers cross-border sections and being checked and made to buy a supplementary ticket on reaching a border city; ② Assuming Luxembourg City can easily be covered in one day, and finding slopes and steps exhausting.

The currency is the euro, prices are among Europe's higher levels — allow generous accommodation and dining budgets; the best season is May–September, Christmas markets run late November to December; in the trilingual environment English works in tourist areas, French and German predominate in the countryside; gorge hiking requires non-slip shoes and rain gear — rocks are slippery after rain.