Five questions about tunnels – Quick Quiz
There’s more to tunnels than meets the eye – and not just because they’re under cover! Here’s five questions about these engineering marvels.
Azadi Tower, Tehran
The Azadi Tower in Tehran’s Azadi Square, scene of many demonstrations in the run-up to Iran’s Islamic revolution – and many more mass protests since.
Stunning spiral
A spiral staircase ascends the interior of the lighthouse at Île Vierge off the north coast of Brittany – the world’s tallest “traditional” lighthouse.