Are there no polling stations where you can submit the ballot in a private location, like a drop box inside a booth or whatever? In the US I've only voted electronically, and it's done in a private booth with a curtain preventing external visibility, so somebody can easily video record the entire process with no realistic way of altering their vote.
No, the booths where you fill out your ballot are on one side of the room, and the ballot boxes are on the other, supervised by an election officer, and near the exit. You:
- collect blank ballots (usually 2 pieces of paper, one for the House, one for the Senate) at the entry,
- walk over to the booth,
- fill out your ballot in secret at the booth (taking as long as you like),
- fold the ballots,
- walk over to the ballot boxes,
- drop the folded ballots into the corresponding box (House ballot in the House box and Senate ballot in the Senate box),
- then leave.
As no-one sees what you write at the booth, you can vote legally, draw pictures on your ballot, write obscenities, write nothing, or a combination.