Still a sand-strewn vacant construction site, St Peter's Square in the centre of the German capital will - God willing - by 2018 host a building that's so unusual it doesn't have an official term.
Not a church, nor a synagogue, or a mosque as such, but a bit of all three, the centre known currently as a "House of Prayer and Learning" will be unlike any other religious venue in the world, its initiators say.
"It seemed to us that there was a very strong desire for the peaceful coming together of the religions," said Roland Stolte, one of two Protestant representatives on the board of the association behind the project.
Not by coincidence, it will stand at a location with a strong and long religious significance.
In 2007 archaeological excavations unearthed the foundations of four previous St Peter's churches that had stood on the site at different periods since the Middle Ages, Stolte told AFP in an interview.
A car park then occupied the site which the city authorities later handed back to the local Protestant community.
"We wanted to revive this place, not by building a church again but by constructing a place that says something about the life of religions today in Berlin," Stolte said.
Nearly 19 per cent of Berlin's 3.4 million residents described themselves as Protestant, according to 2010 official data.
Pastor Gregor Hohberg said it had been crucial to also get the centre's Jewish and Muslim partners involved right from the start, well before work got underway on building it.
