Lucky Number

I have been trying to work with underexposure - without much success. This is the best I was able to produce. 
One thing I've learned is that you need strong contrasts if you want to get anything interesting out of an underexposed shot. Otherwise correcting exposure will only result in an ordinary shot of low quality.
In this case, I only applied Nik's Detail Extractor filter to enhance the wall's texture.

1/640s
f5.6
ISO 100