The main attraction of the hill are the so-called ice pits at the foot of the largest natural rubble field, in which snow and ice are maintained long until spring and there is also very cold air in summer. This is due to the sealing of the lower parts of the rubble field by weathering, so that cold heavy air cannot escape from the resulting tub-shaped parts of the rubble field until it is replaced by even colder air next winter. In the past, partial extraction of the natural rubble happened. They are open, freely moving, without vegetation, only occasionally, old lime trees contribute to their stabilization. The grounded parts of the natural rubble are covered with deciduous forest.
Ice pits in Plešivec belong to the most famous phenomena of its kind in the Central Bohemian Uplands, but it is a phenomenon known from many other places, such as Borečský hill and Kamenná hůra. Below the top there is an ice spring box with a constant water temperature from 5 to 7 °C.
The largest beetle in Europe is a specially protected species. It is the European stag beetle and it has found refuge in the Plešivec Natural Monument.
In the top part of Plešivec there is also a lookout point that offers a beautiful view of the landscape of the Central Bohemian Uplands. The hike to Plešivec can be taken as part of a trip along the Hlinná-Kamýk Nature Trail.