Hampi's Musical Stone Pillars of Vittala Temple, Karnataka

Even now many of those Temples and monuments, no one can replicate, even with all the modern machinery.
Modern science claims it has been able to see planet earth from above only 200 years back.
If you put a line from Rameshwaram to Kedarnath, all major Hindu Temples like Srikalahasti and Tiruvannamalai will be in a straight line!
Instead of constantly cribbing about all the Hindu rituals and celebrations, look into the greatest contributions of Hindus. Hinduism is the greatest science. Straightly put - Survival of Hinduism is the survival of humanity.