Visitors to the Taj Mahal will have to wear masks at all times, keep their distance and not touch its glistening marble surfaces when India's 17th-century monument to love reopens on Monday after a three-month Covid-19 shutdown. Only 5,000 tourists will be allowed in a day, split into two groups, a far cry from peak levels of 80,000 a day who would swarm the mausoleum built in the northern city ...