Le Clos Arsène Lupin is the half-timbered villa that Maurice Leblanc — the inventor of the gentleman thief Arsène Lupin — bought in 1918 and kept until his death in 1941. It has been turned into a small audio-guided museum about Lupin, Leblanc, and the connection between the cliffs and the books: Lupin's lair in The Hollow Needle is the chalk pinnacle off the western cliff.
The tour is more entertaining than usual museum fare — narrated by Lupin himself, complete with theatrical asides and a clever escape-route conceit through the rooms of the house. Allow an hour. A small terrace garden looks toward the cliffs.