Berlin is the capital and the largest city of Germany. Berlin located in northeastern Germany on the banks of the rivers Spree and Havel. Berlin’s economy is mainly based on the service sector due to being one of the most popular touristic destinations in Europe. Other industries include IT, pharmaceuticals, renewable energy, biomedical engineering, and biotechnology. Berlin climate can be best described as a humid continental climate. Berlin is a world city of culture, politics, media and science. More than six million tourists visit Berlin every year, making it one of the most popular cities in Europe. Many tourists come to see historical monuments, including Haus am Checkpoint Charlie, the Berlin Wall memorial, the Fernsehturm (TV tower) which gives a spectacular view of the city, the Reichtags building, and Brandenburg Gate. A number of companies offer walking tours of the city, as well as boating excursions on the river Spree. The best time to visit Berlin is May through September when the weather is ideal for cafe sitting, park lazing and leisurely city strolling. Winter, on the other hand, is literally freezing: Temperatures tend to range in the 20- to 30-degree Fahrenheit range.