With all this talk of the Mayan apocalypse finally arriving on December 21, 2012, privately owned forts should have been flying off the shelves. Instead, prudent rich folks kept their cash in their pockets and left this former Danish military installation on the market. For almost a century, Middelgrundsfortet—King's Island—served as a harbor defense for Copenhagen, but was sold to a private investor in 2002. That investor had been seeking some $12.4M in exchange for the fortified isle, but may have to cut the price to find a buyer in this new, less apocalyptic, year. For more high-dollar properties that should see their prices chopped in 2013, check the map below.
· All Curbed Maps [Curbed National]