The Seychelles' unique marine biodiversity and appealing crystal-clear waters create the perfect conditions for underwater discovery. For snorkelling, head to one of the best sites of the Indian Ocean - Sainte Anne Marine National Park - or take advantage of the once-in-a-lifetime opportunity to swim alongside whale sharks on Mahe. Diving is another way to get close and personal with reef inhabitants (humphead parrotfish, octopus, various types of sharks - including hammerhead, if you're in luck). Seychelles Underwater Centre

Take a boat trip to Nea Kameni, an inhabited island that is part of the volcano's caldera. Given the frequent eruptions in the last centuries, the island is defined by scenery created by the lava flow and sulfuric waters, which are said to have therapeutic benefits. Cruises leave daily from any village, making Nea Kameni a perfect day/half-day trip.

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.