Embark on a captivating journey through nature at Biotopia, an interactive museum nestled in the picturesque Vasaparken. Designed for individuals of all ages, this museum offers a unique exploration of Uppland's rich natural heritage. Its permanent exhibit unravels the origins of Uppland, while lifelike dioramas showcase hundreds of Swedish animals in their natural habitats.

Broadway Grand Prix boasts seven impressive go-kart tracks to show off your racing skills. It also offers a skycoaster, mini-golf and a climbing wall.

The fortification, first erected in the 13th century, still stands today - and relatively well-preserved, at that. An on-site museum tells the brief history of the fort, but its main draw is, perhaps, the unbeatable view over the Medina and the sea surface - things may get a bit crowded at sunset.

Berlin is great for parties and long walks with friends, but it's also a city marked by profound historical events. A visit to the Sachsenhausen-Oranienburg Nazi concentration camp offers a sobering perspective on this darker chapter of history. Just a half-day trip from the city, the camp saw over 200,000 prisoners pass through its gates from 1936 to the end of the Third Reich in May 1945. Primarily housing political prisoners during World War II, the camp's history is a stark reminder of the past.