City Bible Church Monolithic Domes at City Bible Church have become one of Portland, Oregon’s landmarks. Located on a butte, the domes are clearly visible to people flying into the airport and folks driving by on the freeway. City Bible Church — This Monolithic Dome church has a diameter of 230 feet and seating for 3,000 worshipers. That seating is designed to focus on the center platform. Aerial View — Built on a butte and clearly visible by people driving or flying into Portland, City Bible Church has become somewhat of a landmark.