Cost Savings Persuade Megachurch To Go Monolithic Legacy Church — Legacy Church in Albuquerque, New Mexico currently has a congregation of 5,000. Sanctuary — It seats 3,000. The ministry includes special programs for every age group; televised, recorded services; drama presentations; elementary school; bible academy. Welcome Center — Visitors are greeted in the Welcome Center of this Monolithic Dome church. Acoustics — Special panels absorb unwanted echoes. Mega Church — With its huge membership and spacious dome facility, Legacy qualifies as a mega church.