What historical event or place fascinates you the most?

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There's a lot of exiting events, and places even buildings that I find fascinating like the egyptian pyramids, and stone hinge, and other most recent events too, actually my sister kind of got me more interested in historical places, and as for events besides the obvious one, Id have to say that the end of the dinosaurs is one of the most fascinating events because we have all heard so many different theory's of how they died but we still dont really know for sure how and why they died. Well tell me what historical event building or place, past or present, fascinates you the most, I would love to read them.