The Patch is a basically immobile, gigantic mass of trash out in the middle of the Pacific. Most estimates put its size—composed entirely of plastic bottles, chemical sludge, and basically any other kind of debris you can imagine—larger than the state of Texas. You'd probably rather go to Texas.
Although you probably wouldn't want to vacation in Pripyat either, the Zone of Alienation is the 19-mile decommissioned perimeter surrounding the grounds of the Chernobyl incident. It's administered by a branch of government specifically so that no-one is allowed into it, but there are a few hundred residents who refused to move. What's wrong with those people? You probably don't want to know.
Via Flickr: 13bobby
Sure, mud volcanoes aren't nearly as dangerous as their cousins of the magmatic variety, but when they do actually erupt, it's not exactly a pretty sight. In 2001, a new island grew out of the Caspian Sea, due to an increase in volcanic activity—right nearby where hundreds of these bad boys are. Generally, they go off every twenty years, and when they do, they shoot flames "hundreds of meters into the sky" and deposit tons of mud into the immediate area. Try wrestling your way out of that mud.
