Leaders of former Cold War powers will be absent as Donald Trump's 'America-first' policy, Britain's Brexit struggles and Russia's resurgence put a strain on ties.
Fortified with barbed wire and overseen by armed guards who would shoot to kill, the Berlin Wall came down in November 1989, following the collapse of communism.
Since the manual reconstruction of the ripped up papers began in 1995, some 500 bags of fragments — equivalent to more than 1.5 million pages — have been pieced together.
The fall of the Berlin Wall means a lot to Germans from the former East and West. But 30 years later, they do not seem to be as unified as they first hoped.
For almost a year, mainly American and British pilots created a lifeline to support war-ravaged West Berlin, then encircled and blockaded by Soviet forces, with food and fuel.
Just a few weeks after a wall was built in a Munich suburb to separate a refugee centre from a housing estate, there are calls for it to be knocked down.
In response to the huge influx of Syrian refugees into Europe more walls are being built, dividing nations and countries.
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