Gravitational anomaly - or optical illusion

In hundreds of well-known places around the world, the nature of the surrounding terrain can cause an optical illusion that results in the subjective impression that bodies (bottles, cars, etc.) are moving uphill without propulsion - i.e. against the force of gravity. In the vast majority of cases, this deception can also be easily proven.
However, there are places where proof of an optical illusion was not successful. Two of them are in Europe and have been scientifically studied. To anticipate the result: Here, abnormal gravitational phenomena really seem to be present.

The town of Rocca di Papa is not far from Castel Gandolfo, the Pope's summer residence.
Shortly after the village there is an anomaly in the course of this road. Bottles, for example, roll uphill here on a gentle incline without any additional driving force. Even heavy cars can be idling up the hill with the engine switched off.
The strange phenomenon does not exist along the entire incline, but ends abruptly just before the crest, with the result that a coasting car simply stops at this point. If it were an optical illusion, he would have to keep rolling.

German scientists visited the place in their free time to conduct field studies themselves.
The results in brief:
- The subjective impression of the incline (this starts in a small depression in the ground and leads to a crest after about 200 meters) is: if you walk up, you have the feeling of acceleration. You don't think you're going uphill, you think you're going downhill.
- The anomaly does not run parallel to the road, but rather at an angle, so that bottles roll uphill from the roadside towards the middle of the road, for example.

- The biggest mystery is that the effect pulses over time, which was reproducible several times. If at one point z. B. a bottle just rolled uphill, it sometimes stops working a few minutes later to continue rolling later). (That would be a physical monstrosity that has never been observed)

Nevertheless, they were not satisfied with the visual impressions, but carried out a series of scientific measurements.
The use of an electronic precision spirit level with an angle measuring device showed a gradient of around 5% instead of the optically visible gradient.
This is probably the main reason that conservative scientists consider the effect to be an optical illusion. In truth, however, this experiment proves nothing at all, because if it were really a gravitational anomaly, this would of course also affect the spirit level and cause it to be displayed incorrectly.
Measurements with a Geiger counter and with a mobile field measuring device for use in the field were unsuccessful. Neither an increase in natural radioactivity nor the presence of unusual electric or magnetic fields could be detected along the road.
For field use for gravitational measurements, the gravitational force can be determined relatively easily with a pendulum gravimeter. The local gravitational acceleration can be determined by determining the period and the length of the thread.

The pendulum was "calibrated" in Berlin at a location with known gravity.
During the measurement, gravity on the Via dei Laghi was determined to be 3.2% lower than in Berlin.
Now it is the case that gravity is not the same everywhere. There are differences due to the inhomogeneity of the earth's crust. But the largest deviations known to science in this context are only about 0.1 per thousand, i.e. less than one hundredth of the anomaly measured in Italy.
There is said to have been an unofficial study by the University of Bologna as early as the 1970s, which described the site as an abnormal gravitational anomaly.

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There is a similar place in Poland near the spa town of Karpacz in the Giant Mountains at the foot of Mount Sněžka.
Some time later, the same people who were also active in Italy in Rocco di Papa also wanted to investigate this place.
Here, too, the same first subjective impressions: you are going downhill even though you are going uphill. The same with the rolling bottles. Except that no temporal pulsing was noticed here. The winding road layout alone should reduce an optical illusion.
Now precision GPS measurements were also used here, which cannot be influenced by local gravitational anomalies. With the help of a few such position measurements along the road, it was therefore possible to demonstrate conclusively that the road is in fact uphill.
Gravity measurements with the calibrated pendulum as in Italy showed a 4.1% lower gravity than normal. This deviation was also measured by the University of Wroclaw and as
The phenomenon is well marketed for tourism and is a local attraction.

The scientists compared the geological conditions of the places in Italy and Poland and found a common feature: in both cases there is boiling hot water at a depth of about 2 km, which in the case of Karpacz is also used as a healing spring.

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