The Templars came to Portugal in the 12th century and bulit a series of castles along the Tejo River to help defend the new nation from the Moors, including one particularly massive monastery in the town of Tomar. That Templar castle still towers over modern-day Tomar, and its sprawling compound is a Portuguese alternative to Spain's legendary Alhambra palace. Happily, what it lacks in hoards of tourists it more than makes up for with creepy, secretive passageways where it's easy to imagine being stalked by an albino monk or renegade Cardinal.
Although we're not totally sure that there are ancient secrets hidden in the castle's extensive collection of medieval artwork, it sure can't hurt to look. Or can it?