He was shot in a balcony. That balcony is re-created to look as it did that night and is closed off. You can also go into Peterson House, across the street, where he was taken and died a few hours later.
No mark specifically. One side is the theater and you CAN see the booth he was felles in, but not go in. Across the street you can see his deathbed (or at least, the spot of the deathbed ).
There is also a museum in the basement about Lincoln and Booth
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