Have you ever been to Gravity Hill in Mentor, Ohio?

The Ohio site is considered one of the rare “true” gravity hills, where the apparent uphill direction is reportedly the actual downhill grade, rather than merely a misleading horizon.

The effect is still ordinary gravity: cars roll in the direction of the road’s real slope. What makes the Ohio hill unusual is that the surrounding terrain apparently does not create the usual visual-horizon illusion. My earlier explanation was too broad, and I also incorrectly identified the location.