The Brandenburg Gate is located in the capital of Germany, Berlin. It's a neoclassical arch dated from the 18th century. It's considered to be one of the most popular, beautiful and well-known sites of Germany. This triumphal arch is built on the place of city gate that was located on the start of the road from Berlin to Brandenburg.

It was commissioned by King Frederick William II of Prussia as a sign of peace and built by architect Carl Gotthard Langhans from 1788 to 1791. It was fully restored after WW2. Nowadays it is considered to be one of the main European symbols of peace and unity.

More Info: en.wikipedia.org