Rotterdam's Markthal (Market Hall) opened in 2014 and immediately divided the city.

Locals called it an upside-down horseshoe and an ugly grey building. They wanted to know why anyone needed a posh indoor market when there was already a perfectly good outdoor one every Tuesday and Saturday. Then it opened, and the queues stretched round the block.

Designed by Winy Maas, the building is a horseshoe of apartments arched over a food hall, built for three practical reasons: unpredictable Dutch weather, new EU rules banning refrigerated food from outdoor stalls, and chronic housing demand. The ceiling is covered in an 11,000-square-metre artwork called The Horn of Plenty, which is why some call it the Sistine Chapel of Rotterdam.

VoiceMap's self-guided audio tours add an older layer: the Markthal stands on the site of Rotterdam's original 13th-century dam, and archaeologists found the actual 800-year-old wooden structure during construction.