A couple of years ago I was fortunate enough to be allowed to help out at TechEd in Berlin when the city was celebrating the 20th anniversary of the wall coming down.
Like any tourist, I purchased some fragments of the notorious barrier and since then have wondered how expensive they worked out for me.
The two pieces weigh 10 grams and cost €4.50 so not particularly cheap at €450 per kilo.
Looking at the Wikipedia page for the Berlin Wall, the bits of concrete in my possession came from one of the 45,000 sections of “fourth-generation wall” which, when unbroken, each measured 3.6 metres high and 1.2 metres wide. Let’s say 2 cubic metres of concrete was used which probably weighed 4.5 tonnes.
So, at the going rate of €450 a kilo, a complete section of wall would cost €2,000,000 (give or take).
Quite a return on the 350 Deutsche Marks each block initially cost to erect back in the 1970s.