Popularly known as Gunkanjima (Battleship Island) due to its shape and high seawall formation, Hashima Island is one of Japan’s most talked about places in the annals of urban exploration. Occupied from 1887 to 1974 and plagued by rumours of forced labour, Gunkanjima was bought by Mitsubishi in 1890 to mine deep sea coal. It went on to play a key role in the industrialisation of Japan.
Bannerman Castle - Pollepel Island, New York. Bannerman Castle's owner, Francis Bannerman VI, built the structure as storage space after buying the American military surplus from the war with the Spanish. After 200lbs of ammunition exploded in 1920, much of the castle was destroyed and the rest abandoned.
U.S.S. Forrestal - http://www.industrytap.com/the-us-navys-first-supercarrier-sells-for-one-cent/15633 - "The U.S. Navy’s first supercarrier, the now-decommissioned USS Forrestal (AVT-59), has been sold for one cent to Texas-based All Star Metals. What does the company plan to do with its new purchase? Take the supercarrier apart and scrap it."