He is usually worshipped in the aniconic form of lingam. Shiva has pre-Vedic roots, and the figure of Shiva evolved as an amalgamation of various older non-Vedic and Vedic deities, including the Rigvedic storm god Rudra who may also have non-Vedic origins, into a single major deity.
Mahakaleshwar Jyotirlinga
Brihadisvara Temple, Thanjavur
Omkareshwar Mahadev Temple, Shivapuri.Bhimashankar Temple, PuneKedarnath, Uttarakhand
Trimbakeshwar Shiva Temple, NasikVaidyanathdham, Deoghar
Vadakkunnathan Temple, ThrissurSomnath Temple, Veraval
Nageshwar Jyotirlinga Temple, JamnagarRamanathaswamy Temple, RameswaramGrishneshwar Temple, AurangabadGrishneshwar Temple, AurangabadMaheswaram Temple, ThiruvananthapuramNellaiappar Temple, TirunelveliMangueshi Temple, Goa