This peninsula, north of Gdansk, is the site where World War II began, when Nazi German battleship Schleswig-Holstein fired at a Polish garrison on the coast. Visitors can now visit the ruins of the peninsula’s barracks and blockhouses, one of which has been converted into a museum.

Situated half an hour southwest of Groningen, Posta 7 is an all-embracing activity centre suitable for groups of all themes and sizes, be it family or work events. With over a dozen programmes from escape games to bowling to outdoor tours, it's all up to your definition of fun. For the essential bites and drinks, the historic De Postwagen restaurant provides a variety of options including high tea, buffets and barbecue. It's advisable to enquire beforehand about opening hours and availability, including those of the restaurant, as they may be subject to large group bookings.

The fortress of Bourtange, this small village sitting on the German border, is a captivating star-shaped defensive structure completed in the 16th century during the Eighty Years' War. Stroll through its cobbled alleys for a journey through time as you browse quaint shops — including a small candle workshop — alongside bars and restaurants. Regularly hosting events like markets and historical re-enactments, the fort offers both a glimpse into the past and a vibrant contemporary experience for visitors.

Christmas Island is one of the world's truly spectacular tropical seabird rookeries. It's not just the number and variety of seabirds or their magnificent splendour that make the island so remarkable, but also their sheer visibility. Around 80,000 seabirds nest here annually, with 23 breeding or resident species. Birds can be seen and heard everywhere on the island, at just about any time of the day. With just a little effort, birdwatchers can easily tick off a full list of residents in a busy week or a more relaxed fortnight. However, the elusive Christmas Island hawk owl keeps many coming back. More than 100 vagrant and migratory bird species have been recorded here, including eight breeding seabird species and one subspecies. The most numerous is the wide-ranging red-footed booby, which nests in colonies in trees in many parts of the coastal shore terraces. You may see the endangered Christmas Island frigatebird soaring above Settlement — it's the world's rarest frigatebird and nests only on the island. The golden form of the white-tailed tropic bird is an endemic subspecies unique to Christmas Island. Known locally as the golden bosun bird, this stunning bird is graceful in flight and has been adopted as the island's fauna emblem.