The Urban Exploration Resource is a website which offers many resources to the average urban explorer.
A large forum, spread across several websites, allows the community to exchange ideas.
The Location Database allows anyone in the community to create, update, and comment on a specific Location.
A Location is defined as a building, drain, tunnel ... essentially any location where UE might take place.
UER is created and maintained by Avatar-X
Explore the site, and Enjoy!