The prototype for AeroMobil 3.0, a Slovakian-built, fancy flying car, has been running test flights as of this month. One interesting feature is its ability to operate off of unpaved runways such as grass strips and gravel.
The following video was released by them, which shows its transition from car to plane, then zipping around the skies, taking off and landing on a grass runway.
Feel free to learn more about them at Aeromobil.com.