Fort St Louis
Fort St Louis © Serge Melki
St Martin's largest historical monument overlooks Marigot. Fort St Louis was built according to plans sent from France by Louis XVI in 1767 to guard the settlement from invaders. The ruins sit atop a hill, which is worth the 15-minute steep climb for the panoramic view of the island afforded from the summit. Open 24 hours a day, the area has many signs detailing important historical events.