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The so-called "Extremely Large Telescope" is being built on a mountaintop in the Andes at an elevation of about 3,000 meters. And it really is extremely large.

The world's largest optical telescope is still under construction but is raising the roof on its progress.

The world's largest telescope is almost as big as your house—and it’s unlocking the universe’s biggest mysteries.

ESO's Extremely Large Telescope at Cerro Armazones in Chile's Atacama Desert is seen from directly above while its construction continues.

ESO's Extremely Large Telescope is seen from directly above as construction continues towards the observatory's completion.