Barcelona's eternally unfinished Sagrada Familia has grown to become the world's tallest church, but a conflict with residents threatens to delay the finish date for the monument designed over 140 years ago.

Swathed in scaffolding on a platform 54 metres (177 feet) above the ground, an enormous stone slab is being prepared to complete the cross of the central Jesus Christ tower.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.