![Denmark ring fort](https://archaeology.org/wp-content/uploads/2016/06/Denmark-ring-fort.jpg)
KØGE, DENMARK—Archaeologist Jens Ulriksen thinks that a fire was deliberately set 1,000 years ago at the Viking castle Vallø Borgring, and has requested the assistance of police dogs and a fire safety investigator. “The outer posts of the east gate are completely charred, and there are signs of burning on the inside,” he told The Copenhagen Post. The unfinished structure, built on a man-made plateau, is one of five known ring fortresses in Denmark, and is thought to have been the last one built by the Danish king Harald Bluetooth. “Our theory right now is that other powerful men in the country attacked the castle and set fire to the gates,” Ulriksen added. For more, go to "Bluetooth's Fortress."