Standing at the foot of the great Wall to touch this great building, you will find more of a miracle sigh: So here is the cornerstone of the city blocks of reddish brown shine of marble!

Rising levels of dust and industrial pollutants 2 from the surrounding city of Agra, 130 miles (210km) southeast of Delhi, have stained some of its white marble surfaces yellow.

But randomly and wantonly chipping off pieces of marble from monuments which have adorned the city for centuries is. something new in recent times.