There are plenty of locations across Romania that can double for other country settings, including the Swiss Alps, Wild West landscapes and German forests
After meeting a new speedster while also reconnecting with an evil old one, next week's episode will see Barry cross paths with someone he'd never see again and things are about to get very interesting.
Gerard Butler stars in new film inspired by Edward Snowden backstage.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from backstage.com Daily Mail and Mail on Sunday newspapers.