Angkor Wat 

-built by Suryavarman II (r 1112–52) – is the earthly representation of Mt Meru, the Mt Olympus of the Hindu faith and the abode of ancient gods. The Cambodian god-kings of old each strove to better their ancestors’ structures in size, scale and symmetry, culminating in what is believed to be the world’s largest religious building.

The temple is the heart and soul ofCambodia and a source of fierce national pride. 

The sandstone blocks from which 

Angkor Wat was built were quarried from the holy mountain of Phnom Kulen, more than 50km away, and floated down the Siem Reap River on rafts. The logistics of such an operation are mind blowing, consuming the labour of thousands. According to inscriptions, the construction of 

Angkor Wat involved 300,000 workers and 6000 elephants, yet it was still not fully completed.

Watch full documentary here :

https://m.youtube.com/watch?v=h8QBxNzQvNI

Rama Setu Bridge

Lord Rama built setu bridge also known as Adam's bridge between India and Srilanka( to rescue his wife sita)with the help of Vanaras million years ago ..
The “Ramayana” describes the dimensions of the bridge as 100 yojana in length and 10 yojana in width. One yojana is equivalent to about 5 miles (8 kilometers). 
Some have wanted to destroy the remnants of the bridge to open up a shipping channel. The proposal has been denounced by others as heresy and destruction of an important ancient heritage structure.
To watch Scientific explanation with proof,click on link below.

https://m.youtube.com/watch?v=rMeAw-gZ1PQ

Srinivansa Ramanujan

Born in South India, Ramanujan was a promising student, winning academic prizes in high school. But at age 16 his life took a decisive turn after he obtained a book titled A Synopsis of Elementary Results in Pure and Applied Mathematics. 
His total immersion in mathematics was disastrous for Ramanujan's academic career: ignoring all his other subjects, he repeatedly failed his college exams.
(born December 22, 1887—died April 26, 1920,contributions— to the THEORY OF NUMBERS include pioneering discoveries of the properties of the partition FUNCTION.

Inventions By Indians

1) Susrutha

- father of Indian surgery
- the first to practise rhinoplasty in India.
-Susruta emphasized surgical matters, including the use of specific instruments and types of operations

2)   Bhaskaracharya
-discovery of gravity was first made by Indian saint Bhaskaracharya
-Bhaskaracharya has written in the Surya Siddhanta - "Objects fall on the earth due to a force of attraction by the earth. Therefore, the earth, planets, constellations, moon, and sun are held in orbit due to this force."

There are a total of 900 million Hindus worldwide, making HINDUISM the third largest religion (after Christianity and Islam).
Hinduism is thought to have gotten its name from the Persian word hindu, meaning "river," used by outsiders to describe the people of the Indus River Valley.Hinduism has no founder or date of origin.