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• Photography site Photocrowd held a contest for pictures of hidden places around the world.
• There are pictures of everything from abandoned buildings to underground caves.
For the Hidden Worlds photo contest, the photography social network Photocrowd asked its users to "look at architecture from a different perspective and reveal places where we can escape or let our imagination run free, whether it's a personal refuge from the daily grind or an unexplored bit of city infrastructure."
Submissions poured in. The site's users, a mixture of professional and hobbyist photographers, voted on pictures that featured abandoned villages, underground caverns, and hidden nooks.
Here are the top 10 photos.