Leading up to Halloween, let's take a look at some of the creepiest, most macabre places on Earth. 

To kick things off, does it get any more haunting than 200 miles of underground tunnels lined with human bones?...

<p>Leading up to Halloween, let's take a look at some of the creepiest, most macabre places on Earth. </p>
<p>To kick things off, does it get any more haunting than 200 miles of underground tunnels lined with human bones?...</p>

Advertisement