CAPL: Culturally Authentic Pictorial Lexicon is an online visual dictionary for language learners. Learn vocabulary with photographs taken of real objects from many different countries and cultures.
For instance, if you want to know what a walk signal looks like in the U.K:
Or if you want to know not only what a German plug looks like but also how to say it in German:
There is a related site called Pictolang, where you can quiz yourself: