THE TOWER OF BABEL: The spiral minaret of the Great Mosque of Samarra (also known as the Malwiya Minaret) in Samarra, Iraq. The word "malwiya" translates as "twisted" or "snail shell". The minaret is approximately 171 feet or roughly 17 stories) tall.
Kalyan minaret, Po-i-Kalan complex, Bukhara, Uzbekistan. It was also known as "Tower of Death", as for centuries criminals were executed by being tossed off the top. It is an amazing place to see in person.