The Meadowcroft Rockshelter and Historic Village in Avella, Pennsylvania, takes visitors on a journey back 19,000 years to the earliest known evidence of human activity in North America.Most of the site, a national historic landmark, features fairly recent history, including a 19th-century rural village with a reassembled covered bridge, a one-room schoolhouse and a church. It was uncovered by a curious groundhog and Albert Miller, a dedicated farmer. "He was also an amateur archeologist.