Ars Subterranea Affiliations:

Dark Passage
Handcranked Film
The Madagascar Institute
New York Underground
Christopher Beauchamp's Photography
Urban Landscaped
The Suicide Club
Mustard Gas Party
Ruins in ASCII
at.or.at
Laughing Squid
Paul V.

New York Resources:

Place in History
Metropolitan Waterfront Alliance
Forgotten New York
3 Legged Dog
Lower Manhattan Cultural Council
Preservation League of New York State
The Gotham Center
The Monster Walks
Undercity
Glowlab
City Lore
Lost Brooklyn
CUP
Friends of Terra Cotta
Riverside Park Fund

Other Assorted Links:

Abandoned Asylums
Art of Bleeding
Berlin Underworld Society
Bldgblog
Center for Land Use Interpretation
City of Sound
Infiltration
The Haunted Palace
Museum of Lost Wonder
Opacity
Roadside America
Roma Sotteranea
Subtopia
Suzy Poling
Toyshop Collective
Urban Resources
Urbanized
Vienna Unterwelt