
1793
The Louvre opens to the public. The Louvre opened in Paris as a public museum. It is now the most visited museum in the world.
Wikipedia: LouvrePhoto: Benh LIEU SONG ( Flickr ) / Wikimedia Commons (CC BY-SA 3.0)
5 moments from 1793 to 2003: discovery, creativity and courage, each with a source to read more.
5 moments

1793
Photo: Benh LIEU SONG ( Flickr ) / Wikimedia Commons (CC BY-SA 3.0)

1844
Friedrich Bessel worked out that Sirius must have an unseen companion, from the way it wobbled. The companion was spotted years later.
Wikipedia: Friedrich Wilhelm BesselWikipedia: Sirius
Photo: Canis_major_constellation_map.png : Torsten Bronger . derivative work: Kxx ( talk ) / Wikimedia Commons (CC BY-SA 3.0)

1948
The prank TV show Candid Camera made its television debut. Its catchphrase: "Smile, you're on Candid Camera!"
Photo: Candid Camera / Wikimedia Commons (Public domain)

1990
NASA's Magellan probe arrived at Venus and mapped almost all of the planet with radar.
Wikipedia: Magellan (spacecraft)
Photo: NASA / Wikimedia Commons (Public domain)

2003
The Okinawa Urban Monorail opened in Naha, the island's first railway since the war.
Wikipedia: Okinawa Urban Monorail
Photo: 663highland / Wikimedia Commons (CC BY 2.5)
Moments chosen for discovery, creativity and courage. Each one links to a source where you can read more; photos are credited to their owners.