The French capital of Paris has taken a further step towards normality after the end of the COVID-19 lockdown. Its emblematic landmark, the Eiffel Tower, has this week re-opened. It had been shut for more than three months, which is its longest closure since WWII. But there are restrictions for the reopening. Fewer visitors are allowed in, they have to follow a one-way system and the third floor – the least spacious level – is off limits. Plus, there is a catch.