A replica of the Eleanor, one of the ships involved in the Boston Tea Party in 1773, a protest of a tax imposed on the American colonies by the British government. It's part of a museum in Boston Harbor. Patrons can throw crates of tea over the side, which are then pulled back onboard for the next group of tourists to toss.

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"How do you know I'm mad?" said Alice.
"You must be," said the Cat, "or you wouldn't have come here."