Easter Eggs

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A list of known Easter Eggs in Civilization VI.

Firaxis References[ | ]

On the Broadway Wonder's billboards you can see a few of the Sectoids from Xcom another title from Firaxis Games (See image below). Holding the Alt key while dragging the screen will let you rotate the camera and get a few more views.
Frederick Barbarossa's (Germany's Leader) brooch is emboldened with the Firaxis Games' Logo (See image below).
If you leave the map over a Holy Site you can hear bits of the musical track "Terra Novum", the theme from Civilization V Brave New World.

The Pizza Party! Achievement is a big shoutout to Teenage Mutant Ninja Turtles (See image below). Good luck trying to unlock it though.
In the Civilopedia, the Neighborhood District refers to both Mr. Rogers and Sesame Street as idealized neighborhoods.
The We Are The Champions achievement is a tribute to the legendary Freddie Mercury of Queen.
The Luftballons achievement is also a tribute to 99 Luftballons from Nena.
The Man on the Moon achievement is a tribute to the REM song Man on the Moon
The Dedication "Wish you Were Here" is a tribute to the Pink Floyd song of the same name.
The achievement Army of Cthulhu is a reference to R'lyeh being based off of nan madol
The Surveyor governors final promotion "Parks and Recreation" is a reference to a sitcom of the same name.
The achievement Hello Cleveland is a reference to the movie This Is Spinal Tap, and is an achievement in the game Rock Band 2 as well
The "And the walls came tumbling down" achievement, which is unlocked after loosing 6 percent of roman civilization to one eruption of Vesuvius, is a secret nod to the hit 2014 single Pompeii, by Bastille, which shares those lyrics.

If you zoom in on water tiles and "shake" the camera, you can hear the sound of water splashing.
You can input any of the icons in the game into your Religion, (See image below). (Thanks to Torgard)
When you unlock the Hello Cleveland achievement, after the rock band's riff plays, you will hear the words "Hello Cleveland" shouted by your rock band's singer as the music dies down
When you have a fortified Scout, a button appears that lets you pet the scout's dog

Inputting [ICON_ICONNAME] into the input field will force it to show up as the icon. You can find all of the icons in XML files at:

Steam\SteamApps\common\Sid Meier's Civilization VI\Base\Assets\UI\Icons

"For example, I named my religion "SNIB [ICON_RESOURCE_CRABS] SNAB", whose icon is in Icons_Resources.xml."