What in the World is Chicagohenge?

Due to Chicago’s mostly symmetrical street grid, sunsets and sunrises align with the grid twice a year when seasons change, for both the vernal and autumnal equinoxes, creating what is known as “Chicagohenge.”

https://www.nbcchicago.com/news/local/as-spring-begins-heres-how-to-catch-a-chicagohenge-sunrise-or-sunset/3690966