I have included both young adult and adult Christian/inspirational romance
books - a few contemporary and a few historical.
Until Tomorrow (Christy and Todd book 1) - by Robin Jones Gunn.
"Christy and Todd are joined by their best buddy, Katie, as they traipse
around Europe for three weeks. Traveling from the fjords of Norway to
the canals of Venice, their relationships are tested when their varying
Christy by Catherine Marshall.