The Taj Mahal, standing at approximately 73 meters (240 feet), is recognized as India's tallest monument. While Qutab Minar is also very tall (72.5 meters), Taj Mahal's overall structure and dome make it the tallest monument in the country. Char Minar in Hyderabad and Padmanabha Swamy Temple in Trivandrum are significant structures but not as tall.