An underground ossuary in Paris is also a popular tourist attraction

Workers arranging human skulls and bones during restoration work of the Paris Catacombs, which welcomes half a million visitors each year. — AFP

The Paris Catacombs, the massive underground ossuary which attracts hundreds of thousands of tourists a year, are once again the focus a television series.

Here are five things to know about the final resting place for several million Parisians, which are featured in the show Berlin, as they were before in The Walking Dead: Daryl Dixon and Lupin.