Someshwar Nath Mahadev Mandir is an age old temple located in Aeraj. The major deity of the holy temple is of Lord Shiva. Pilgrims and devotees of Lord Shiva come to the shrine not only from India but also from Nepal.
The festivities on the occasion of a seasonal fair known as Shrawani Mela, during July and August, are magically divine. There are many other temples in the area around, and for this reason only, Aeraj is known as the holy city of East Champaran.