The "Cathedral of the Plains" is Saint Fidelis Catholic Church in Victoria, Kansas. It has seating for 1,100 people, which, at the time of it's dedication, made it the largest church west of the Mississippi River.
The Romanesque design church contains German windows & works of art, Austrian hand carved stations of the cross, and Italian marble altar. The church is open to the public (free) from dawn to dusk. Stop by early on a Friday evening and you may be treated to the sounds of the Saint Fidelis organist rehearsing.