This game uses the earliest inception year attached to each photographed building or monument on Wikidata.

• The figure is when the building first took shape, not when it was restored, reopened, or became famous.
• Some landmarks were rebuilt, expanded, or heavily altered later, but the timeline still anchors to the earliest construction year in the source.
• This first pass keeps Common Era years so the slider stays readable.

A building can be younger than the story told around it, and older than the version tourists think they know.