Each year, millions of so-called “dark tourists” flock to curious sites to witness what remains of their tragic pasts http://on.natgeo.com/2Hy5Aoi

Each year, millions of so-called “dark tourists” flock to curious sites to witness what remains of their tragic pasts http://on.natgeo.com/2Hy5Aoi 

https://twitter.com/NatGeoTravel/status/966477663945797632