This is a heartwarming story: Muslims Invited To Pray Inside Synagogue
I'm not a religious person, but I like to read about people helping each other out. Seems an accidental fire made the Islamic Society of Mid-Manhattan's mosque unusable when about 600 Muslims came to services to pray for their brothers and sisters in New Zealand. So the rabbis at the historic Central Synagogue down the block invited them to use their space.
I guess sharing space is very easy because Muslims worship on Friday, Jews on Saturday, and Christians on Sunday. Congregations could pool funds and build one common space for all three services. Shows what is possible if people actually had the love for their neighbors in their hearts the way their faith teaches.