To begin with, I single out three places with many traces of highly developed civilizations of the past, India is one of such places. In general, this is Egypt, South America (especially Peru) and India about which there will be a lot of interesting things in this article.
It is worth starting with the temples, since it is these structures that are the most incredible in terms of the complexity of many elements, and they were very common in ancient India.
Often temples were built from materials that were difficult to process. In addition, various statues and bas-reliefs carved in the smallest detail in granite and basalt are no less impressive.
Columns are worth highlighting as a separate element in India, but they are closely associated with temples, since it was basically there that they were created and processed at some incredible level.
The carved monolithic columns of granite and basalt were made in some incredible form. The creation of many of which is either impossible in our time due to the level of development, or it will take a lot of money and the most advanced equipment. In India, these temples, along with the columns, are thousands of years old.
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The funny thing is that scientists explain this creation of columns with primitive tools, at a time when this is impossible in our time.
It is also worth noting separately some features in certain temples, which are not only difficult to explain, but also contradict modern science.
For example, in one of the temples there is a "hanging column", the base of which is not in contact with the surface. And in the temple of Vittala, they created "singing columns", each of which has its own note.
How they gave certain properties and features to columns or certain objects is still unknown, but somehow they did it.
* Singing columns * in the Vittala temple.
And probably the last thing worth highlighting in India is the statues and bas-reliefs. Above, I just mentioned that each temple stands out with bas-reliefs, but in fact, this is an amazing feature, since the accuracy of processing and the number of such elements in the temples is at a prohibitive level.
In some temples, the number of small statues is in the thousands, and the statues were made both small and large enough. Some were allegedly hollowed out and carved in granite, which is almost impossible without the use of advanced technologies.
We can say that in India there is still a lot of amazing things - these are cave temples, incredible "wells", which quite possibly had a completely different purpose and much more.
Above, I have listed the main part of the possibilities of an unknown civilization of the past on the territory of modern India. I think everyone understands that much of this is impossible for ancient people without the lack of technology, and the question is not in time, but in the impossibility of a word in general.
It should be borne in mind that a lot was built and created supposedly at the same time, but in different parts of India, which further complicates the work, since there were supposedly few people thousands of years ago and they did not have technology.
Although it should be clear that someone helped them, for example, the so-called "gods", or the civilization itself was well developed even relative to the current level of technology development.