Main Holi famous spots are Mathura, Vrindavan and Barsana. However jaipur, Varanasi, Agra, hampi and Shantiniketan are places where holi is grandly celebrated too.
Holi - Around the India
https://www.tripoto.com/india/trips/holi-around-the-india-58c7ba35b6639 Kindly check the above Tripoto link for more details.