BOTW Directory - Recreation > Outdoors > Urban Exploration > Europe

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Catacombs of Paris - Details the history of the area, which dates back to the 12th and 13th centuries.
Closed Stations in Paris' Subway - Provides photographs of old ruins of abandoned subway stations in Paris, France. Also provides list of areas, articles, and maps.
Forbidden–Places.net - Highlights photos of abandoned buildings and other infrastructures. Also includes photos and video clips.
Friched.Net - Displays news and updates, profile of group, photos, and links to recommended sites.
Underground Passages: The Underground World Dug by Man - Features tours of man-made underground passageways.