The activity log is the ultimate source of truth. This is the complete story of a person's journey in Marketo.
FYI

Marketo is now standardizing language across all subscriptions, so you may see lead/leads in your subscription and person/people in docs.marketo.com. These terms mean the same thing; it does not affect article instructions. There are some other changes, too. Learn more.
1. Go to the Database.
2. Select All People.
3. Click the People tab. Select a person Id number.
4. Click Activity Log.
Behold. The activity log! This is a collection of all the information that happens over time for a person.
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Learn more about filtering the activity log to see specific person activities.