Excellent post over at BLDBLOG on the history of Bannerman's Arsenal, a ruined island castle in the middle of the Hudson river, created by a war profiteer who was at one time the world's largest arms dealer. Bonus points for the amazing accompanying photos by Shaun O'Boyle, whose site Modern Ruins has been featured on the blue previously.
posted by jonson on Nov 17, 2007 - 14 comments

Here are some pictures of ruined cities and a few sanctuaries. (3rd link is to geocities)
posted by Tullius on Jan 21, 2006 - 12 comments

The Third Reich In Ruins
posted by crunchland on Oct 15, 2003 - 16 comments

Victorian Secrets of Washington, D.C.: haunting photos and thoughtful essays documenting one man's fight to draw attention to D.C.'s neglected architectural heritage: "This site won't be much of a beauty pagent because we 'll concentrate on buildings that are vacant, abandoned, deteriorated, distressed, or just plain at risk because they are standing in the path of development . . . if even one Victorian finds an angel because of our page, we'll consider it a thousand percent return on investment."
posted by ryanshepard on Feb 14, 2003 - 13 comments

Ho Hum, just the remains of another four thousand year old city discovered on the ocean floor. This one is Harrapan of the Indus Valley which was home to the largest of the four ancient urban civilizations of Egypt, Mesopotamia, India and China. The ruins extend for 9 kilometers and located around 40 metres below the water surface. "Due to geological processes and tectonic events, the entire [Gulf of] Cambay was faulted — taking down with it the then existing part of the river sections and the metropolis"
posted by lagado on Jul 2, 2001 - 3 comments