Once upon a time (not so long ago), the Burj Khalifa was just concrete under construction - a very different sight from today ...

From the Burj Khalifa in Dubai to Big Ben in London, the following tourist landmarks are some of the most expensive places to snap a souvenir photo while abroad.

It’s also the reason the Burj Khalifa started coming together so fast. Less than a year after Emaar had selected Smith and SOM to design the supertall structure, they’d broken ground.