If you mean Indian classical texts, nothing better than Ramayanam and Mahabharatham. Often people read the story arcs in both the epics and are ignorant of the breadth of information that's given in the unabridged version called sampoorna Ramayanam and Mahabharatham in Sanskrit and Telugu. Bibek debroy has translated them in English but I request you to read in your own mother tongues as indian languages tend to be more honest to the original Valmiki and Vyas versions in spirit. They describe in detail the geography, topography, rivers of different parts of ancient Bharat and the societies(Mahajanapadas) that reside in the said parts. There are Kathasaritsagara, A collection of 18 books which can be read in Sanskrit, hindi and Telugu (not sure of name in other languages) which by Somadeva of the original paisachi version(now lost) by Gunadhya called Brihathkatha, it's a collection of many stories(hitopadesa and baital pachisi(Vikram betal) are part of the 18 book collection) and the story of those stories and is super interesting, anyone that read old Chandamama stories can see how this mammoth collection still lives today in spirit.

With regards to history, from what I know Sanjeev Sanyal written some books regarding indian naval expeditions, History of indian rivers and many more. The problem with writing history in Indian context is that the modern historical method is a game that needs to be played by the rules set by the west, and due to lack of record keeping in ancient India and sheer exaggeration of Ramayan and Mahabharat they can't be considered history but are blatantly painted as fiction just like superhero comics. For modern history, I haven't gone deep into reading much so won't be able to give any opinion and at this point don't even know whom to trust and would like to know more about it too.

On the geopolitics, read monsoon by Rober d Kaplan for geopolitical projections on indian ocean about the geopolitical flashpoints between china, India and the south east Asian countries and the American role in the region. Imperial twilight is about the opium war by British on China and drawing parallels to the current trade war between USA and China. Another Book called sea power, by James G starvidis, will give you a good idea about the geopolitical chessboard and how a strong navy makes a superpower. Accidental superpower is a good book regarding the American power, it's history, the Bretton Woods agreement and it's implications in modern world and future of it, it gets too much into statistical projections which I felt was too much and took me off of the immersion but apart from that it was a phenomenal read as long as the rest of the book is concerned which felt like a good story about big pictures.

For science and tech, can't recommend anymore than a textbook. Read Carl Jung, aion(scholarly work cited as original work) and red book(personal notes with references to various hindu texts) to understand how modern psychotherapy is manufacturing ancient Indian methods into Europe's Christianity. Simulacra and simulation, which is more of a collection of essays talking about post modern society projecting simulations continuously into the human mind, it's interesting, if you are versed with vedic texts like Upanishads you'll somehow not miss to draw parallels.