Modern Mulgandhakuti Vihara
Sarnath (10 kms from Varanasi) is where Buddha gave his first sermon at Sarnath after achieving enlightenment. Stupa at Sarnath is one that is well visited by all guests. Sarnath area has Jain Temples, Temples build by other Buddhist countries including China and Stupas.
Sarnath offers extensite insight into Buddhism and therefore must visit for any Buddhist traveller. Sarnath has limited stays and most guests do a half day visit from Varanasi.