I'll start with the Catholic church, namely the St Francis de Sales Oratory in St Louis. It is impressive from the outside with a soaring spire:
|St Francis de Sales Oratory|
The other church, the Fourth Presbyterian, is in Chicago. It has a courtyard:
The interior is very fine (the first photo looks best if you click to expand it):
It was not that long ago that such impressive church architecture was being created in America. The St Francis Oratory was completed in 1908; the Fourth Presbyterian in 1914.