A Mandir is a religious hall where Hindus assemble to pray to their God. It is not much different from a Church or any other holy shrine. Most Mandirs contains statues representing their respective Gods. Some Mandirs/Temples have seating accommodations like benches and chairs while others have mats for seating on the floor.
Temple
Aksharadham is not the biggest hindu temple because the followers of their deity are not hindus. The biggest hindu temple is probably the Brihadeeshwara Temple in Thanjavvur, Tamilnadu.
Vraj Hindu Temple was created in 1988.
St. John's Hindu Temple was created in 1975.
I think the 1st hindu temple was built between 1500BC-600BC.
The dwarka temple i think
No
I suppose the Dwarka Temple.
The prayers at a Hindu temple can be lead by a person appointed by the temple management committee or a hereditary priest.
In the centre of a Hindu Temple there is a idol of God. Sometimes this idol is not found in the centre of the main temple rather underground in a dark chamber.
The Hindus pray in temples. A Hindu Temple
Poems