This is what 30 floors look like :).

and another one showing the horizon below

http://i.imgur.com/JTcBIS7.jpg

That looks awesome!

Was there a limit to the height?

No, we can go more height, i am at like 40 floors so :)

I did something similar. I'm building what I call my "Inverted Fortress": I'm at eight floors in this screencap, but am up to thirteen floors on my computer at home:

http://i.imgur.com/SoRXcjl.jpg

It's a quite challenging resource-wise due to the increased need for wood with each additional floor. Just the requirements for the surface area of each floor is incredible:

• Floor 1: 27
• Floor 2: 55
• Floor 3: 91
• Floor 4: 135
• Floor 5: 187
• Floor 6: 247
• Floor 7: 315
• Floor 8: 391
• Floor 9: 475
• Floor 10: 567
• Floor 11: 667
• Floor 12: 775
• Floor 13: 891
• Total: 4823

That doesn't count the requirements to build the stairs and posts needed!