A novel by Jack Finney set in modern New York in which the main character joins a secret government project to transport people back in time by placing them in the mindset of the time they're attempting to travel to and then placing them in a place that hasn't changed since that time.
In the case of New York City, they choose the antique building called "the Dakota" which is on 5th avenue up across form Central Park. Through this method, the main character is transported back to 1882 in which he then gets involved in the plot, which is excellent as well.
I highly recommend this book, both as an interesting science fiction and mystery book but also as a fascinating look at New York history.