The Thoreau Farm is the birthplace of Henry David Thoreau and is open for guided tours on weekends beginning in May and through the summer. We also recommend the Concord Museum, which is open year-round, seven days a week (except some major holidays), and has items that belonged to Thoreau, like the bed, desk and chair from his cabin.
Thoreau, who studied under and worked for Ralph Waldo Emerson, was an author and an abolitionist. His best-known book is Walden (archive.org) and many of his works are compiled in Walden, and On the Duty of Civil Disobedience, which influenced environmentalists and civil rights leaders like Martin Luther King, Jr. and Mahatma Gandhi.
You can walk along the rim of Walden Pond and make an effort to support its preservation through the Walden Woods Project, founded by rock musician Don Henley of The Eagles. Read about it here: walden.org.
The Thoreau Farm is the fifth stop on Massachusetts Trail Part 2!