(Source: hoiabaciuforest.com)
8. Hoia Baciu Forest in Cluj-Napoca, Romania
Known as the world's most haunted forest, Hoia Baciu Forest is shrouded in mystery –– and that's in both the literal and figurative sense. Visitors report that the often foggy expanse of  land causes "intense feelings of anxiety and the feeling of being constantly watched." And according to local folklore, those who go into the forest never come back out . . .

Image via Haunted Forest.