Urbe, also called UE or in full Urban exploring is the game of products of civilization which are commonly not open for the regular crowed. Think about abandoned buildings, ships, military locations and such.
Itself it is a great “sport” find abandoned buildings and trying to get a peak inside and take some pictures. However, we always have some real champs. Like people who like to visit abandoned missile silos and such. The most secret places of the cold war, guarded and kept secret to the enemy and the local public are now after the cold war open for Urban Explorers. On the web you can find numerous locations of those abandoned locations and pictures made by those who already have visit.
A little tip, make a list of locations and if you are somewhere close visit those places who shaped the military, political and daily lives of many for so long.