Yes May be you see many people are sitting and gathering around there but depends on the time yo want t visit the Tomb,these days night times are busy time so better to go there around 5-7 PM local time. But generally do not worry about this issue people are easily move out after respecting and taking photo in a few minutes. wish you guys happy time there.

Yes, Iran is safe. I was travelling alone across the country and being a woman I had no problems walking in the streets late evening or going out for dinner. The only danger for me was traffic as there are different rules crossing the streets and I didn't feel comfortable doing it in the dark

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