A local Czech woodcarver named František Rint was given the daunting task of arranging the collection of more than 40,000 human remains in a visually impressive way-and he clearly delivered. In true “waste not, want not” fashion, the abbots decided to put the exhumed bones to good use. But overpopulation kicked in and the old bodies had to be dug up to make room for fresh corpses. Back in the early 1300s, an abbot of the Sedlec Monastery brought back holy soil from Jerusalem and scattered it across the church’s cemetery, and suddenly everyone wanted to be buried in that sacred ground. The incredible Sedlec Ossuary is a small chapel located beneath the Cemetery Church of All Saints, known worldwide for its macabre decor.
Because of their potency, the Brazilian government bans the public from ever setting foot on the island (as if you would want to). And because they couldn’t track down the birds and wait for the poison to kick in, their venom adapted to become five times stronger than that of their mainland counterparts-capable of killing their prey instantly, as well as melting human flesh. Without any ground-level prey on the island, the snakes learned to hunt in the treetops and strike at birds from the air. When sea levels rose some 11,000 years ago and separated Snake Island from mainland Brazil, the newly isolated snakes became hyper evolved-and hyper terrifying-to adapt to their changing environment. The site earned its moniker due to its insanely high density of golden lancehead vipers some studies report an average of one to five snakes per square meter. Located about 90 miles off the coast of São Paulo, Ilha de Queimada Grande (also known as Snake Island) is one of the most dangerous islands in the entire world. Finally, if you get past the bat smells and cockroaches crawling up your legs, there are several other wonderful creatures you just might happen upon, including snakes, scorpions, freshwater crabs, and the infamous giant scutigera centipedes-poisonous critters that are at least three inches long. Wherever the guano is, that’s where the cockroaches will be (read: everywhere). If you can make it through the river of bat droppings, you’ll then encounter several million Malaysian cockroaches scurrying around. And don’t even think about slipping, because the handrails are just as filthy as the floor. First things first, Gomantong is home to more than two million bats, which leads to impossibly thick layers of guano (otherwise known as bat poop) covering the ground. The Gomantong Caves in Malaysia are geographical wonders, with limestone walls reaching up to 300 feet in some spots, but visitors often leave the site describing it as one of the most disgusting wildlife experiences they’ve ever had. And just in case you forgot why the town is deserted, you can occasionally see smoke billowing out from the subterranean fires, which scientists estimate will continue to burn for at least another 250 years. If you ever find yourself in the deserted city, you'll find many torn down buildings, crumbled sidewalks, and the cracked, graffiti-filled Route 61. As of 2014 (the date of the most recent census), only seven residents remain, although Centralia seems like a complete ghost town upon visiting. Since those disturbing occurrences, the town's population decreased sharply. Although the citizens were aware of the situation, they weren't truly troubled until two isolated incidents some years later: a gas station owner reporting abnormally high gasoline temperatures in his underground tanks in 1979, and a young boy nearly falling into a 150-foot-deep sinkhole in his backyard in 1981.
However, when a mine mysteriously caught fire in 1962, the flames began to spread underground via the interconnecting tunnels. From the late 1800s to the 1960s, Centralia was a quaint but bustling town in Pennsylvania, thanks to its prosperous coal mines.