STRUCTURES quiz - what is the purpose of this structure in Boston Massachusetts?

STRUCTURES quiz - what is the purpose of this structure in Boston Massachusetts?

Continuing the reboot of STRUCTURE questions that were fairly popular...

Some people suggested a few changes, and that's what we're going to try. Rather than ask what the structure is and where its located, we're going to tell you where it is and ask if you can name it and tell why it exists... what is its purpose?

Every day, I'll try to post a picture of a Structure somewhere in the World. Your task is to name the Structure and tell what its purpose is... bonus points for being more specific. The answer will be given the next day.

This is intended to be fun.

If you really don't know anything about this, post a funny answer of what you think about it.

If you have the right answer, you get a Like. If you have the funniest answer, right or wrong, you get a MHO, one for girls, one for guys. If no one has a funny answer, then the best answer gets a MHO, one for girls, one for guys.

Today's structure (pictured from various angles) is located in Boston Massachusetts. Can you tell us its name and why it exists? As a Bonus, can you tell us some interesting things about it?

Updates
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This sculpture is called "The Embrace", and commemorates Martin Luther King Jr. and his wife, Coretta Scott King, depicting four intertwined arms, representing the hug they shared after he was awarded the Nobel Peace Prize in 1964.
STRUCTURES quiz - what is the purpose of this structure in Boston Massachusetts?
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