What did the Tower look like?

Throughout the ancient world we see pyramid-like structures called Ziggurats.  These stone buildings have stood the test of time and demonstrate that our ancestors had advanced technology.  It is believed that the Tower of Babel had the similar structure as that of a Ziggurat, and the Bible tells us that there was also a city built there (Gen. 11:5).

Ziggurats (Source: Answers in Genesis)
Ziggurat (Source: Answers in Genesis)