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.

The National Botanical Conservatory of Brest contains around 1,700 endangered species of plants, which are all grown and cultivated in the reserve’s greenhouses. It is dedicated to the protection and growth of endangered species from around the world. The lush premises are open to visitors.

The Reichstag, with its iconic glass dome, is home to the Bundestag, Germany's lower house of parliament. In the 1990s, British architect Sir Norman Foster reimagined the building, blending its historical grandeur with a modern, spacious design. The accessible glass cupola offers stunning views of the city and a unique perspective on German politics. While entry to the cupola and roof terrace is free, advance booking is crucial because of the Reichstag's popularity. To learn more about the German political system and the daily life of the Parliament, you can book a 90-minute guided tour. Guided tours of the Reichstag Building are held in the weeks when Parliament is not sitting.