Wait, yes. Dude, Alexander and Genghis Khan are like they happened only yesterday. Hindusim is much older than all of that, and I don't mean only in terms of religion. The culture itself is very old, so to speak.

God this is going to be a long comment.

I don't know how immersed you are w.r.t Hinduism, which gave birth to, no rather off-shooted other religions like Buddhism & Jainism. Here I can only give a very top-level view to help you make an entry:

There are two epics of the Hindus: The Ramayana and the Mahabharata. Read both, they're brilliant classics. These two epics are stories about rise and fall of political power, affairs, conceit and ensuing wars between leaders of different Hindu kingdoms. Let's say kingdoms of an aggregate land mass we now call India, Sri Lanka, Afghanistan that stretches up to far, far east to places like Cambodia.

I could not confirm how far in the west did Hinduism spread out but will do so given that I am excited about it now.

Both epics are mythology by today's standards, but the stories in each are what Hindus vehemently believe as true. All (not most) of warring cities in both these epics exist inside and outside of India (or sunk under the ocean [1]) even today. I mean literally.

On axis of time, both these two epics are separated from each other by two 'Yugas' [2]. We are living in the Kaliyug where kali == machines and yug == time-frame. Yugas are of varying length, first being Satayug about 1,728,000 million years. Man exists during this period as life forms from scratch in this universe. Alexander was like a fucking second ago when you're talking ages of this length.

I suggest start with Yugas and you'll start seeing math, numbers, conclusions, geometric progressions and astronomy right in there. No need to accept anything is true or false, w.r.t written and confirmed history. But you'll love visiting places, and connecting it with the historical texts.

It goes up the Bohr's model of atom (Paramaṇu), the theory of what nucleus and subatomic particles were about (hell yes!), the nuclear bomb (Brahma Asthra) and how these were used in warfare, negotiation and peace keeping. Several other concepts of what seems similar to magic of quantum physics, treatment of time-space curvature, extraterrestrial life, theory of relativity and additional dimensions of gravitational physics (though refuted by modern practitioners of course) all exist in discussions. May or may not be correct, but the level of thought can be appreciated.

Astronomy, for example, scales to the level of predicting solar cycles, cycles of universe (311.04 trillion years?[3]), variable length of life of man/species, sub-sub-events like the ice age, age of the machines, age of only truth which you will find pretty fascinating to read, if not believable.

Let me just throw in the starting point [2]:

[1] http://en.wikipedia.org/wiki/Dwarka

[2] http://en.wikipedia.org/wiki/Yuga

[3] http://en.wikipedia.org/wiki/Metrics_of_time_in_Hinduism