- Hitler's alpine bolthole getting multi-million dollar upgrade
- Josef Stalin's retreat is in the resort town of Sochi, host of the 2014 Winter Olympics
- After leaving Albania in 1939, Albania's King Zog settled in Parmoor House in Buckinghamshire
- Napoleon's digs are on view at Château de Fontainebleau
(CNN)With Adolf Hitler's WWII Bavarian mountain retreat set to undergo a multi-million dollar makeover, travel to the onetime lairs and luxury retreats of tyrants is in the spotlight.