CHENNAI: Pollution may have turned its white marble yellow as it takes what appears to be an irreparable toll on the world's most celebrated monument to love, but here's hard evidence that the allure of the 361-year-old has not faded one bit: Taj Mahal continues to generate more than twice as much revenue through tourist visits than any other monument in the country.According to estimates from the Centre , the mausoleum and its integrated complex of structures raked in Rs 21.84 crore, mostly in entrance fees . The top 20 monuments collected Rs 80.01 crore in the fiscal, but the collection at Agra Fort, a distant second to the Taj, was Rs 10.22 crore in that fiscal, tourism minister Shri Shripad Yesso Naik said in the Rajya Sabha on Wednesday. Qutab-Minar , Delhi's landmark red sandstone tower, came in at third with Rs 10.16 crore, Humayun Tomb was fourth (Rs 7.12 crore) and Red Fort fifth (Rs 6.15 crore).However, the authorities spent only a fraction of the collection, Rs 2.85 crore, on maintenance and repairs of the Taj in the last fiscal. With the extremely polluted Yamuna making a giant loop to almost touching distance of the northern face, heritage experts have warned that much more will be needed to preserve the structure."The government should do some more marketing for its monuments and weave in more tours around the monument. There can be a full moon tour and also a sound and light show so that revenue can be generated from night too. Now, the monument is open from sunrise to sunset," said M K Ajith Kumar, president, Asia Pacific Tours.The monuments in and around Delhi alone have generated revenue to the extent of Rs 49.36 crore out of the total collected for the 20 top monuments. This includes the Agra Fort (Rs 10.22 crore), Qutab Minar (Rs 10.16 crore), Red Fort (Rs 6.15 crore) and Humayun Tomb (Rs 7.12 crore).Beyond Delhi, Fatehpur Sikri recorded the maximum revenue generation of Rs 5. 62 crore. "The revenue generated in all the monuments is in the form of tickets for entry, photography, videography and for safe keep of personal belongings while visitors have a look at the monument," said an official of the Archaeological Survey of India, the custodian of all national monuments. The revenue generated by these monuments is also used for the upkeep and to undertake repairs periodically, the official said.The Ellora and Ajanta caves together generated Rs 3.06 crore of which the Ellora alone contributed Rs 2.06 crore.Down south the Pallava architecture at Mahabalipuram topped the revenue chart. The monuments near Chennai generated Rs 2.72 crore as revenue, the highest among all monuments in the south. While the Charminar Fort in Hyderabad recorded Rs 84.76 lakh, the Golconda Fort recorded Rs 92.92 lakh. Group of monuments in Hampi, Karnataka recorded Rs 1.57 crore.In terms of expenditure, Rs 10.15 crore was spent on the upkeep of Qutab Minar, the maximum among all monuments. In Tamil Nadu, Rs 1.21 crore was spent on the upkeep the Darasuram temple , a Unesco heritage site.