At Kyamwilu hill, about 12 kilometres from Machakos town along the Machakos-Kangundo road, lies a mysterious hill where objects defy gravity.
The phenomenon has baffled both residents and visitors, attracting curious onlookers to the site.
For instance, if you pour water on the road it moves upwards instead of the opposite direction as one might expect. Gravity hills occur in many parts of the world, including the United State.
Experts say the gravitational pull of such hills is uneven, i.e. the force at the bottom is weaker than higher up causing objects to move up the slope.
Gravity, scholars say, is not uniform everywhere on earth. Areas closer to the equator experience a slightly weaker gravitational pull than those farther away.
According to an article in ScienceAlert, gravity hills are found across the world including Confusion Hill in California and Magnetic Hill in Canada.
Mr Emannuel Ruto, a geologist, said that uneven gravity pulls have been reported in other places in the country such as Mai Mahiu.
At Kyamwilu hill, locals charge tourists a fee to demonstrate the phenomenon.
The demonstration includes pouring water on tarmac and setting a car in parking. The water and car begin moving uphill.
Mr Victor Muniafu, the Machakos chief tourism officer, said the county plans to build a tourism centre at the spot.
“We will put up a tourist centre with different activities that will benefit residents,” Mr Muniafu said.
The facility will have a rest area, restaurants and toilets so that people enjoy the scenery.
He said the county did not have data on how many people visit the site. A report by the Machakos County Assembly Committee on Culture observed that the devolved government had done nothing to enhance the site. The committee said that no revenue was collected from tourists who visited the place.