After more than 140 years under construction, the Sagrada Familia in Barcelona is on track to finally be completed by 2026. But it’s not the only landmark in the world to have taken its sweet time being built – and it isn’t the one that took the longest either. Here, we take a look at how long some of the world’s most famous landmarks took to build. 

Click through the gallery to discover the construction times for some of the world's best loved landmarks, spanning less than a decade to over two millennia…