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Organized into helpful categories here are thirty must-bookmark resources for would-be urban explorers around the world.

Opacity is a great place to start developing a taste for the allure of abandonments.

Infiltration is one of the oldest and most respected

28 Days Later

UER is another very useful urbex forum

Flickr has many collectives

Wikipedia is of course a good place to start

Europe: Urban Travel

United Kingdom: Urbex UK

Australia: Sleepy City

Russia: Abandoned dot RU features very raw, rough-and-ready images

Pennsylvania: Forgotten Pennsylvania covers some of the most famous American abandonments

Ohio: Ohio Trespassers

Florida: Flurbex is a Florida urbex forum

Indiana: Lost Indiana is a great resource

Detroit: Forgotten Michigan

New York City: The LTV Squad

London: Derelict London

Legends of America focuses on a more specific period and region of abandonments

English Russia

Dead Malls

Defunct Parks

Lost America

Web Aperture

Old Retired Vehicles

The International Registry of Sunken Ships