Predjama Castle, Slovenia
Pedjama Castle is an easy sell to castle lovers. Most famous for being built into the side of a 400-foot cliff, it may also call to mind visions of Tolkien's Helm's Deep. But this real-world stronghold has the requisite dungeons, secret tunnels, and bloody history to make it a must-see on its own merits. Visit Pedjama Castle during the annual medieval tournament, held each July, for a once-in-a-lifetime experience.