Luxembourg City dominates the country's cultural landscape. The Bock Casemates, designated UNESCO World Heritage in 1994, form a network of underground passages carved into rock beginning in 1644 when the Spanish occupied the fortress. The tunnels extend 17 kilometers beneath the old town, though only sections totaling approximately 9 kilometers remain accessible after most were sealed following the 1867 Treaty of London neutrality declaration. The Grand Ducal Palace functions as the official working residence of Grand Duke Henri, who assumed the throne in 2000. The palace building dates to 1572, constructed originally as Luxembourg's first city hall before conversion to ducal purposes in 1890 when the personal union with the Netherlands terminated. The adjacent Adolphe Bridge, completed in 1903, spans the Pétrusse Valley with a stone arch rising 42 meters above the valley floor, making it the world's largest stone arch at completion. Notre-Dame Cathedral represents Gothic revival architecture from 1613 to 1621, though major reconstructions occurred in 1935 and 1938.
MUDAM, the Museum of Modern Art designed by I.M. Pei, opened in 2006 on the Kirchberg plateau. The National Museum of History and Art holds permanent collections spanning Luxembourg's archaeological record from the Gallo-Roman period through contemporary art, housed in a building complex that merged historic structures with modern additions completed in 2002. The Philharmonie Luxembourg, designed by Christian de Portzamparc and opened in 2005, seats 1,500 and serves as the primary concert venue. These three institutions anchor the Kirchberg cultural district, which also contains the European Court of Justice and multiple EU administrative buildings established after Luxembourg became a founding ECSC member in 1952.
Vianden Castle sits on a hilltop above the Our River in northern Luxembourg. Construction began in the 11th century on Roman foundations, with major building phases continuing through the 14th century. The structure fell into disrepair after 1820 when the Orange-Nassau family sold it piecemeal, but Grand Duke Jean transferred ownership to the state in 1977, initiating restorations that continue. Victor Hugo stayed in Vianden during his 1871 exile from France, and the house where he lodged now operates as a museum. The town of Vianden itself has maintained a population under 2,000 since the 19th century.
Echternach holds the distinction as Luxembourg's oldest town, founded in 698 when Northumbrian monk Willibrord established an abbey. The current Echternach Abbey basilica dates to the 13th century, though reconstructions occurred after the building suffered destruction during the Battle of the Bulge in December 1944 and January 1945. The abbey now houses the Echternach Abbey Museum and an extensive photography exhibition titled "The Family of Man," curated by Luxembourg-born photographer Edward Steichen. The collection, donated to Luxembourg in 1994, contains 503 photographs from 273 photographers across 68 countries, assembled for the Museum of Modern Art in New York in 1955. The annual Echternach Dancing Procession occurs on Whit Tuesday, drawing approximately 13,000 participants who move through the town in a specific hopping pattern, a tradition documented since the 15th century and inscribed on UNESCO's Intangible Cultural Heritage List in 2010.
The Mullerthal region in eastern Luxembourg covers approximately 112 square kilometers. The Mullerthal Trail stretches 112 kilometers through sandstone rock formations, narrow gorges, and beech forests. The trail divides into three loops plus an extra tour, each marked separately. The rock formations resulted from erosion of Luxembourg Sandstone layers deposited during the Triassic period, approximately 200 million years ago. The town of Beaufort in Mullerthal contains two castles: a medieval fortress dating from the 12th century now in ruins, and a Renaissance manor built in 1649 that remains inhabited privately.
The Moselle Valley forms Luxembourg's southeastern border with Germany, following the Moselle River for 42 kilometers from Schengen to Wasserbillig. The region produces Crémant de Luxembourg, the country's sparkling wine, using traditional méthode champenoise. Luxembourg wine production totals approximately 12 million bottles annually from 1,300 hectares of vineyards, with 80% designated for sparkling wine production. The towns of Remich, Grevenmacher, and Wormeldange anchor the wine route. Remich holds an annual wine festival in August. The European Museum Schengen occupies the site where representatives from five nations signed the Schengen Agreement on June 14, 1985, initiating passport-free travel within participating European countries.
Esch-sur-Alzette, with approximately 36,000 inhabitants, ranks as Luxembourg's second city. The city grew during the late 19th century as iron ore deposits in the surrounding Red Lands region fueled steel production. The blast furnaces of Belval, operational from 1911 until closure in 1997, now form Belval-Université, where two preserved blast furnaces stand next to University of Luxembourg campus buildings opened in 2015. The Rockhal concert venue, opened in 2005, operates in converted industrial structures.