A piece of Portsmouth, N.H., history is officially on the market for $2.85 million.

Built circa 1710 for Tobias Langdon, the great-grandfather of John Langdon, the first governor of New Hampshire, 171 Gates St. is a three-bed, 1 3/4-bath Colonial gem tucked in Portsmouth’s charming South End.

“When you walk into that house, you feel like you’ve stepped back in time,” said Jason Goodrich of Coldwell Banker Realty, who has the listing .

The current owner has spent the last 20 years restoring and maintaining the 2,450-square-foot home to its original integrity, which features pine floors measuring up to 30 inches wide and five fireplaces.

Step into the entry foyer, where you’ll find the walls covered with a mural that cascades upward via a triple-run staircase.

“When you come in o

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