The Monument presents milestones and upcoming events. Its construction requirement includes Base level 13, and the building has a single level.
How milestones work
Milestones record events you can review as progression continues. The display distinguishes locked, ongoing and ended states, so an event appearing in the list does not mean it is already available to enter.
The War Era view shows the current season's days and cycle progress. This is a timeline of activity progression rather than a construction queue. A countdown on an event and a timer on a building upgrade refer to different things.
Milestones and daily reminders
The Activity Square gathers personal tasks and alliance reminders in the To-do List. The Monument concerns milestone progression and upcoming events instead.
When a milestone leads to an activity, that activity still uses its own entry conditions and rewards. Raising the Base opens construction options, but the Monument's event states describe a separate part of progression. Constructing it does not automatically complete the milestones shown inside.