21 Buildings You Need To See In Your Lifetime

The first buildings were built some 12,000 years ago. 

We've come a long way since then — creating temples to our gods, houses for our operas, and museums for our art that rival nature's beauty.

Here are 21 buildings you need to see before you kick the bucket.

The Burj Khalifa in Dubai, UAE, is the world's tallest building, standing at 2,717 feet.

You can see why the National Center for the Performing Arts in Beijing gets its nickname, 'The Egg.'

The City of Arts and Sciences in Valencia, Spain, houses an aquarium, an opera house, and an IMAX theatre all in one.