I don't tell my people crushes online- I try to save that for in person! but I do have some serious all-time heartthrobs. Some are of the, "If you had a working time machine and currency in all nations and time eras, and a universal translator, whom would you want to date?" variety. All my crushes are that way, actually, since a lot of the people are living and I would go there in a second.
I have a major thing for polymaths!

Leonardo Da Vinci (I read a great analysis that suggested Mona Lisa was an in-mirror self portrait of Leonardo himself, in drag. He makes my top 10 most likely closeted transgender historical figures list too, so I guess I have a thing for MTFs)

Blaise Pascal (sexy sexy mind. Oh Blaise.)

Thomas Jefferson (oh baby. I'll be your Monticello.)
Ada Byron, Lady Loveless (I am speechless. You/Me let's get integral.)

Baruch Spinoza, aka Benedict de Spinoza (You can posit your assertions in me, Bennie!)

Eleanor Roosevelt. (Be MY first lady.)

Florence Nightingale. If you don't develop sepsis and die after your surgery, its because of her gorgeous gorgeous mind. (The original nurse is also the original HOT nurse.)
My list would be a lot longer, but I have learned to distinguish the people I WANT, from the people I WANT TO BE, or WANT TO LOOK LIKE.
Sorry to:
Brooke Shields as herself (I had a crush on her when we attended school together)
Drew Barrymore as herself
Rachel Maddow as herself
Paulie Peretta as Abbie Schiuto
Milla Jovanovich as the fifth element
Pippi Longstocking (in the books)