I tried Mormon Tabernacle and Salt Lake City Tabernacle, but I didn't know what it was called - I just thought it was where the Mormon Tabernacle Choir was based and went with that.
Since you're being very specific about the temple clue; could you allow things like "salt lake city mormon temple" or "mormon temple salt lake city"? Seems unfair to penalize people for being too specific and calling it the name it's widely known as.
I never heard the capitol called the Congressional Building. It's called the U.S. Capitol or the Capitol building, and there are separate congressional office buildings such as the Longworth and Dirksen Congressional Office Buildings which are part of the U.S. Capitol Complex.
No mention on the Wiki article of it also being called the Congressional Building. Google search seems to agree with ander; "congressional building" is a generic term that does not refer to only one specific building.
So the goal of these quizzes should be to include the easiest, most obvious answers that everyone already knows?? Some of you Jetpunkers don't actually want to learn new things or challenge yourselves, huh?
Capitol = building;
Capital = city
The only thing that I didn't get is Fenway Park.