I really (REALLY!) enjoyed the Outlander series by Diana Gabaldon. It's a historical fiction w/ time travel and a sold romance. I believe it's been mentioned on here before.
Warning: these books are long. About 1000 pages each and there are 7. I got thoroughly sucked in on book 1, but they're not for everyone.
Disclaimer: books contain sex, violence, horrific prison abuse, spousal discipline (18th century style) Culloden hi-lights, Jacobites, and a mancrush or two.
Well written with thoroughly researched Scottish details.