For those persons "d'un certain age" (ie over 30 or so) the Berlin Wall and it's fall remain a potent symbol of an age we (apparently wrongly) thought might be behind us. Little pieces of it are for sale on Ebay for $30-50. Imagine my surprise recently in Montreal to come face to face with a graffitied full slab on display at the Intercontinental Hotel.
What would it be worth? Much more than the perhaps $100-200 value of the slab of reinforced concrete. What adds the most value? My guess is that the rich graffiti on a piece of the wall is far more valuable than a bare portion of the wall. I remember full pieces selling for $5-10,000 as the wall came down - now who knows $50-100,000? (Or far more given this smallish piece on sale for $50,000)(No points for guessing which side was facing the West)
