The tunnels of Cu Chi hide an entire world including classrooms, kitchens and medical facilities underground. Today you can see the tunnels from above and even try to go down one, so as to better understand the hardships that Vietnamese soldiers had been through during wartime. One is left utterly amazed by the determination and endurance of those who dug through solid soil, gravel and sand to construct this 200-kilometer (125 miles) long underground network.

Teufelsberg, an artificial peak in Grunewald, was formed from the rubble of World War II. It provides a sweeping 360° view of the city. During the Cold War, this location served as a key surveillance site for British and American intelligence agencies. Nowadays, it's a popular spot, especially on weekends, when guided tours offer a glimpse into its past, enhanced by striking street art galleries.

There are 57 nature reserves within Halmstad Municipality, with different types of flora and fauna. You'll find vast marshes, deciduous woods, steep mountain slopes, rushing waterfalls and a bird sanctuary. Lace up your hiking boots or pump up your bike tires and discover a Halmstad that surprises. If you prefer to explore by water, gently gliding in a canoe is a delightful experience. Distances are short, so you can feel like a true adventurer one minute and be back in your hammock the next. Galgberget, or 'Gallows Hill', just a stone's throw from the city centre, is peaceful despite its name hinting at the site's history. Walking paths, bridleways and fitness trails share space in the beech and mixed woods. With views over Laholms Bay and Halmstad's city centre, it's a perfect spot to rest on one of the benches. Several hiking trails wind through Haverdal's coastal forest reserve. If you listen closely, you might almost hear the gnarled pines lamenting the drifting sands and harsh sea winds. Further north, the nickname of Skipås Nature Reserve, “God’s Green Meadows”, speaks for itself. Venture deeper inland into the heart of the countryside, where meadows and lush mushroom-filled forests offer a bounty of outdoor activities. In Simlångsdalen, tranquil lake waters beckon for leisurely canoeing excursions.

Looking at the vast pavilion roof of the Sony Center and the many high-rise buildings around it, it’s difficult to imagine that Potsdamer Platz for a long time was in the death strip of the Berlin Wall and was nothing but a desolate wasteland. These days, Potsdamer Platz is a major public transportation hub, as well as a centre for business, entertainment, culture and shopping. Here you'll also find an IMAX cinema and the German Film Archive — Museum of Film and Television in Berlin. Perfect destination after taking a mandatory pic next to the Brandenburg Gate.