It’s always seemed like the world’s two great builders, Man and Nature, have been involved in a millennia long struggle, desperately trying to one up the other. This ‘match-up’ has never really been declared but you know it exists. And in trying to get one over the other, their styles have often blurred. Here are a few structures that look they could have been made by either, or even both. Can you tell which is which? Go on, have a try.

1.

MyWallpapers

2.

Mapio

3.

Wherecoolthingshappens

4.

QualityVillasItaly

5.

Tripfreakz

6.

Wired

7.

Topturkeytravel

8.

Tumblr

9.

Reddit

10.

Swide

11.

Tourismprofile

12.

Thousandwonders

13.

WallwideHD

14.

Geolocation

15.

Iliketowastemytime

16.

Hotel-Plaza

17.

Iliketowastemytime

18.

Topgreenparadises

19.

Wikipedia

20.

Reddit

So, how many did you get right?