It has been dubbed the "Wonder of Berlin". And if a Protestant pastor, a rabbi and an imam can realise their shared dream, the world's first house of prayer for three religions will open its doors in the German capital in four years' time, with the building costs being paid for by donations.
The unique project is called the "House of One", and its aim is to provide a place of worship and contemplation for adherents of the world's three main monotheistic faiths, although the building will also be open to all. It will house a church, a synagogue and a mosque under one roof.
"Berlin is the city of wounds and miracles," said Rabbi Tovia Ben-Chorin, one of the three behind the project. "It is the city in which the extermination of the Jews was planned. Now, the first house in the world for three religions is to be built here," he added.
The fundraising drive was launched this week, with a symbolic handing over of the first brick. The House of One's backers hope to raise the €43.5m (NZ$69.8m) needed to construct the hexagonal-shaped brick building, on a site next to Berlin's central Museum Island, entirely through sponsorship. Anyone can donate money online. A single brick costs €10.
The idea was born in 2009, when archaeologists excavating a section of ground on Museum Island unearthed the remnants of Berlin's earliest church, the Petrikirche, and the city's Latin school, which dates back to 1350.