https://outreach.wikimedia.org/wiki/GLAM/Newsletter/April_2013/Contents/Swed...

"The hackers decided to work together to combine three/four databases: Europeana, Wikipedia, lists of cultural institutions and a database of public art. Together this web app produce a list of cultural heritage institutions near a selected point (including one based on your mobile phone's GPS location)."

http://misc.mickenordin.se/digikult/ Works by taking your IP address or lat/long to geolocate you.

Also, check out http://en.m.wikipedia.org/wiki/Special:Nearby , new from the Wikimedia Foundation mobile team and available for desktop and mobile versions of the website:

https://blog.wikimedia.org/2013/05/29/wikipedia-nearby-beta/

"As a first pass, the mobile team has focused on using the Nearby page to surfaces articles in close proximity that lack images, inviting users to add one. Upon visiting those pages, the user will be prompted to illustrate the article, which they can do quickly and easily if they’re on a mobile device that supports taking and uploading photos."