Buildings may be some of the most impressive works of art we have.
After sinking untold sums of money into their construction, we can walk through the finished products and even live inside them.
Here are some of the most ambitious projects from architects around the world, and whose works span thousands of years.
Drake Baer contributed to an earlier version of this article.
SEE ALSO: 16 of the most beautiful schools in the world
The oldest building we know of is Göbekli Tepe in present-day Turkey. Built somewhere around 9500 B.C., archaeologists aren't certain of its function, but it was probably religious.
Since then, humans have built some pretty rad structures. In the past year, we've seen futuristic openings like the Fulton Center in New York ...
... and the Penleigh and Essendon Grammar School in Melbourne, Australia.
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