Red Cathedral

The Red Cathedral is a location in Mechanicsburg used to perform a ritual when - similar to a coronation, from the descriptions given.

Whether this is the same structure as the cathedral from which one accesses the Heterodyne family crypt is unclear, but likely. Except for very large cities where multiple faiths coexist, there are rarely multiple cathedrals in any given municipality.

Possibly Relevant Outside Information
From Wikipedia:


 * A cathedral (Lat. cathedra, "seat") is a Christian church that contains the seat of a bishop. It is a religious building for worship, specifically of a denomination with an episcopal hierarchy, such as the Roman Catholic, Anglican, Orthodox and some Lutheran churches, which serves as a bishop's seat, and thus as the central church of a diocese. 


 * In the Greek Orthodox Church, the terms "kathedrikos naos" (literally: "cathedral shrine") is sometimes used for the church at which an archbishop or "metropolitan" presides. The term "metropolis" (literally "mother city") is used more commonly than "diocese" to signify an area of governance within the church.


 * There are certain variations on the use of the term "cathedral"; for example, some pre-Reformation cathedrals in Scotland now within the Church of Scotland still retain the term cathedral, despite the Church's Presbyterian polity which does not have bishops. The same occurs in Germany, where Protestant churches (mostly non-episocopal)... [are] using the term as a merely honorary title and function, void of any hierarchical supremacy. As cathedrals are often particularly impressive edifices, the term is often used incorrectly as a designation for any large, important church.