Most of Opole’s city walls were destroyed in the early nineteenth century, primarily because they no longer performed any real useful defensive function. There is though a stretch that has been reconstructed and re-opened near to the city’s cathedral. The project was completed in 2009 at a cost of 1.2 million zloty, with walkways constructed so that visitors can walk alongside the top of the walls.
There’s just one little problem, which is that the steps have been closed off as the wooden structure has started to fall away. The steps are now barricaded off at the base, but the city is promising to have it all re-opened in 2020.