The Innocents (1961)

Hmm, another haunted mansion story endorsed by Martin Scorsese. And another experimental '60s film that wasn't a hit at the time. On those bases, I might have expected good cinematography but little fear. OTOH, there is the element of children. It's also based on a Henry James novella, The Turns of the Screw, and adapted primarily by Truman Capote.

In 19th-century England, Miss Giddens (Deborah Kerr) shakily accepts the invitation of an aristocrat (Michael Redgrave) to be the governess for his nephew, Miles (newly recognizable Martin Stephens), and niece, Flora (Pamela Franklin), who have been largely raised by the various hired help. The children have a good deal of cutie charisma, but sometimes they appear to know too much and/or care too little. Could they know about the merciless-looking figures who spook Miss Giddens but whom no one else confesses to seeing?

The Night of the Iguana (1964)

What sounds like a cheesy horror is actually based on a Tennessee Williams drama. His plays have a good track record on screen, if not even better than on stage (see A Streetcar Named Desire; Cat on a Hot Tin Roof; and Suddenly, Last Summer). This appears to be the last silver-screen feature in his lifetime, affording more suggestiveness than the '50s would allow. Having John Huston at the helm couldn't hurt either.

Disgraced Rev. Shannon (Richard Burton) finds work as a tour guide in Mexico. He regards his present company as mostly annoying biddies, one of whom, Miss Fellowes (Grayson Hall), accuses him of molesting teen Charlotte (Sue Lyon), who actually put the moves on him to no avail. In order to postpone his firing until he can regain the tourists' support, he abandons the itinerary and drives to a remote, inexpensive hotel that belonged to a late friend of his, sabotaging the bus to prevent an escape. The widow and current owner, Maxine (Ava Gardner), likes him just enough to reopen off season. Soon after, Hannah (Deborah Kerr) and her nearly gone grandfather "Nonno" (Cyril Delevanti) show up, hoping to buy room and board with art and poetry; Shannon talks Maxine into a tentative agreement. From there, Shannon, Maxine, and Hannah share the main focus.