Czech This
The Czech Republic boasts their own underground network that dates all the way back to the 14th century. In total this mysterious tunnel system stretches about 12.5 miles and once served the population by storing food and beer. But there is more to this story than many know.
Hidden Treasure
Food and beer was one thing, but hidden treasure is definitely something else. For centuries there have been rumors that the underground passageways hide a historical treasure, but no-one seems to know much more than that. Sounds a little like an Indiana Jones story to me.