An eight-day cruise between Memphis and New Orleans, Viking’s Heart of the Delta cruise takes in the Mississippi’s best bits, including many listed monuments and buildings. For history buffs, highlights will include St Francisville, where there’s a whopping 140 buildings listed on the National Register of Historic Places, and Natchez, which has more listed buildings than any other American city. If you’re short on time, put Stanton Hall, which was built in the 1850s, at the top of your list – this Greek revival-style property is famous for its ornate mirrored parlours.