Odessa Catacombs in France run over 2,500 km, and to get a sense of how much tunnel system that really is, it is only 2138 km from Odessa to Paris. Once lost, it is very difficult to find an exit from the maze of dark, unlit tunnels and it is fairly easy to get lost in here. In 2005, a girl got lost while drunk off her head in the Odessa catacombs while partying with some friends. Months later they found her shriveled corpse in one of the tunnels.
Gas chambers in Auschwitz also known as the Death Camp was an extermination center created by the Nazis to eliminate the Jews. It was estimated that 2.1 to 2.5 million Jews, Soviet soldiers, Gypsies, and Poles were gassed to death in this place, and their bodies were burned in piles nearby. Tourists who visit the Auschwitz concentration camp are gripped with a sense of despair. Some even break down in tears. There are accounts of people feeling spooked at this place.
13Ilha da Queimada
Ilha da Queimada Grande (Snake Island) in Brazil is an island, which is so densely populated by poisonous snakes the Brazilian Navy has quarantined it and a biologist once said that when on the island you are "never more than three feet from death." For each 5m^2 there are 3 to 8 venomous snakes and the coral snake (considered the most dangerous snake from Brazil) got a little adapted for that island.
Hashima Island in Japan was a mining island that was abandoned in 1974. It was completely evacuated overnight. The rotting remains of everyday items are still scattered around it. You can only get there a certain time of the year, so if you get trapped on that island, may God help you. It's also off the coast of Nagasaki.
Mount Huangshan in China is most famous for its beautiful peaks and cliffside paths. There are thousands of hand-cut steps in the stone, stretching for miles and miles and they are just the basic paths. There are more advanced ones, where you got to literally walk on planks while anchored to safety cables.
Darien Gap in Panama is an undeveloped swampland that separates Central and Southern America. It is full of plants that can kill you, insects that can kill you and if you think you can avoid them, there are insurgents that kidnap you. They only release you to your family safe on receiving the demanded ransom. It is considered one of the most dangerous places on earth.
Bolton Strid in England is the most innocent looking stream but is one of nature’s most deadly booby traps. Though it looks like you could just hop across the rocks if you miss you will die for sure. It packs very rapid currents just a couple of feet below its surface. No one really knows how deep it really is. Nobody who has ever fallen into the Strid has survived. It has a 100% fatality rate.
On the Overtoun Bridge of Scotland for some odd reason, dogs leap to their death. When someone takes their dog on that bridge, it tries with all of its might to jump off and kill itself. If it survives the fall, it will get back up, and try to jump off again. Nothing the owner does to restrain their pet seems to stop the dog from trying to kill itself.
The Capuchin Catacombs in Italy display endless rows of preserved corpses and lots of them are small children and babies. The friars who were buried there were part of the Capuchin order, and there's a saying there that translates: “that which you are, we were; that which we are, you shall be.” They weren't scared at all of their deaths, they just accepted the cycle of life. The catacombs are decorated with their bones to sort of symbolizing how humble they were and how they submitted to a higher power.
20Gates of Hell
The Gates of Hell in New Jersey is a legendary passageway that leads to a network of underground tunnels and storm sewers, and some say to the lair of the evil one himself. It is a very old tunnel with an arched stone ceiling about eight feet high. Generations of local teenagers have told stories of what lay deep inside these darkened corridors, and have dared each other to venture forth. There are local folklores that red-eyed mike guards the gates to hell and that the portal to hell is down in the groove.