Berlin thinks it is making religious history as Muslims, Jews and Christians join hands to build a place where they can all worship. The House of One, as it is being called, will be a synagogue, a church and a mosque under one roof.
The location is highly significant, according to one of the three religious leaders involved, Rabbi Tovia Ben Chorin. "From my Jewish point of view the city where Jewish suffering was planned is now the city where a centre is being built by the three monotheistic religions which shaped European culture," he told the BBC.
Can they get on? "We can. That there are people within each group who can't is our problem but you have to start somewhere and that's what we are doing."
The imam involved, Kadir Sanci, sees the House of One as "a sign, a signal to the world that the great majority of Muslims are peaceful and not violent". It's also, he says, a place where different cultures can learn from each other.
Each of the three areas in the House will be the same size, but of a different shape, architect Wilfried Kuehn points out.
Each faith will keep its distinctive ways within its own areas, Pastor Hohberg says.