Rabindranath Tagore, the Nobel Prize-winning Indian author, called the Taj Mahal “a teardrop on the cheek of time.” It is perhaps India’s greatest cultural treasure and its pre-eminent tourist attraction.

But the Hindu extremists who have become a driving force in India are so obsessed with demonizing Muslims that they are smearing it as an abomination.

Built in the 17th century by the Mughal emperor Shah Jahan as a tomb for his beloved wife, Mumtaz Mahal, the Taj Mahal is considered one of the wonders of the world and a magnificent symbol of enduring love. Millions flock to marvel at its shimmering magnificence, with intricately inlaid and carved white marble inscribed with verses from the Quran, every year. And that is exactly what the Hindu right finds so galling.

In October, it came to light that the state of Uttar Pradesh — where the Taj Mahal is located, in the city of Agra, and which is headed by the firebrand Hindu cleric Yogi Adityanath — had omitted the monument from its tourism brochure and cut its funding from the state’s tourism budget. Sangeet Som, a member of the Hindu nationalist Bharatiya Janata Party, railed that the Taj Mahal was “a blot on Indian culture” built by “traitors.” And Mr. Som’s party colleague Vinay Katiyar blustered, completely unglued from historical fact, that the Taj Mahal was actually “Tejo Mahal, Lord Shiva’s temple,” referring to the Hindu god.