In the last years the Imaging Atmospheric Cherenkov Telescopes (IACTs), thanks to their improved sensitivity in the very high energy (VHE; > 100 GeV) gamma-ray domain, revealed many new sources mainly along the Galactic Plane. However ~50% of the VHE sources are still unidentified. Some of these sources have several positional counterparts and hence several different possible scenarios for the origin of the VHE gamma-ray emission; their identification remains unclear. Others have so far no counterparts at any other wavelength. Particularly, the lack of an X-ray counterpart puts serious constraints on emission models. Several newly discovered and still unidentified VHE sources will be reported here.