Oldest Human Hangout In North America

Avella, Pennsylvania

Since a groundhog unearthed an ancient tool in 1955, people have been arguing about just how long people have lingered beneath this rock overhang south of Pittsburgh. Some say 16,000 years, some say 19,000, some say a lot less -- but the higher numbers would make this the oldest human habitation in America, and that has brought a lot of attention and, lately, a lot of money.

In 2008, the Meadowcroft Rockshelter opened a multi-million dollar pavilion over the excavations. Now the Paleo-Indians' fire pits are far better protected than the Paleo-Indians ever were, and you can imagine yourself as a cave-person in flat, dry, dirt-free comfort.