From the viewing platform, visitors are encircled by the 15m-high and 60m-long view, from the neighbourhood of Kreuzberg in the west to the Mitte district in the east, with the iconic spike of the Fernsehturm television tower, smoke-belching factories and dilapidated houses dominating the horizon.

BBC: Bringing the Berlin Wall back to life

Perched up high on the hill of Montmartre in the 18th arrondissement, it has a panoramic view of Paris, encompassing the grey roofs of the city skyline as well as the Tour Montparnasse, Les Invalides and the Eiffel Tower, lined up perfectly from left to right along the horizon.

BBC: Parisian bars with a view