Launched in 1797, USS Constitution is the oldest commissioned warship in the world still afloat. She earned her famous nickname, Old Ironsides, after British shot failed to penetrate her thick oak hull during a battle with HMS Guerriere in 1812. The frigate is still officially a US Navy vessel, crewed by active-duty sailors who lead tours through the gun decks.
The ship is berthed at the Charlestown Navy Yard, the end of the Freedom Trail. Adjacent to her is the USS Constitution Museum, where the hands-on exhibits — climb into a hammock, fire a cannon (simulated), pull on the lines — are aimed at children but interesting for everyone. The Navy Yard itself is a National Historical Park; once one of the world's busiest shipyards, it now feels like a quiet harborside walk with the destroyer USS Cassin Young moored alongside.
To reach the ship, take the ferry from Long Wharf to Pier 4 — a much better arrival than driving — or walk across the Charlestown Bridge.