Dubbed the architectural jewel of Luxembourg, the town of Esch-sur-Alzette boasts an incredibly diverse architectural landscape featuring buildings in Art Nouveau, Art Deco, French Neo-Gothic, Modernist and Post-modernist styles. It's an open-air museum of European architectural efforts with guided tours on offer.

Celebrated Luxembourgish architect François Valentiny inaugurated this peculiar crisp-white building in Remerschen in late 2016 as a space to showcase his own and partner Hubert Hermann's artistic creations (over 3000 permanent exhibits). The permanent collection is regularly complemented by exhibitions featuring works by other artists.

Both castles of Beaufort are worth a visit. The first, demolished during the Battle of the Ardennes of WWII, is now in ruins, the second — a Renaissance château— can be visited on a pre-booked guided tour during high season. Tasting of a locally made fruit liquor is included in the price of admission.

The grand, fairy-tale castle-like main building in Timrå was built in 1883–1885 as a summer residence for the timber magnate Fredrik Bünsow, who was one of Sweden's most powerful timber barons at the time. The architects were Isak Gustaf Clason and Fritz Eckert. Clason is known for designing the Nordic Museum and Hallwyl Palace in Stockholm. The beautiful castle (or Villa Merlo, as it is actually called) is now a cultural heritage site and houses Svenska Cellulosa's central archive. In the summer, you can take a guided tour to see the many rooms and halls that still retain their former glory. Even the garden alone is well worth a visit.