BOTW Directory - Recreation > Outdoors > Urban Exploration > North America > United States

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Friends Of Vast Industrial Concrete Kafkaesque Structures - Showcases a selection of pictures that feature abandoned and old structures, such as the flood control channel found in Los Angeles.
Industrial Archeology in California - Provides insights on abandoned infrastructures found in the state. Includes pictures and descriptions for each.
Institute for Urban Exploration - Contains background information of the organization devoted to expeditions of modern, but deserted infrastructures and places within different cities.
San Francisco Artillery Fortifications - Presents a slideshow of photos of fortifications and tunnels near San Francisco, which were explored by the author.
Sutro Baths - Describes the infrastructures long abandoned by the modern city life. Also contains collection of images posted.