In the side-by-side images above, the photo on the left shows a city as seen by astronauts on the International Space Station, and then photo on the right shows a photo of a neuron imaged with fluorescence microscopy. One is massive and seen from a grand scale, while the other is microscopic and cannot be seen by the human eye, yet they look strangely similar in their structure.
Infinity Imagined has a gallery of these comparisons of cities and neurons, showing the strange and striking similarities between the two.
You can find more of these images over on Infinity Imagined.
(via Laughing Squid)