With about 25,000 visitors annually and no roads or electricity, Isle Royale's seclusion is both its appeal and what makes recent deaths there so mysterious.

Two campers were found dead last weekend at Isle Royale National Park, officials announced Tuesday. Park rangers received two separate reports of two campers found dead on Sunday at around 4 p.m. at a remote backcountry campground on the Lake Superior island, the park said in a statement.