There appears to be a glitch currently impacting some Google Maps users, causing their historical Timeline data to vanish.

Learn more about slavery after the Civil War by scrolling through the timeline and map. Points on the map include photos and more information about key dates in United States history from 1860-1950.

If you have it enabled, you can also create a Google Maps timeline, which lets you see where you traveled on a specific day, any attractions or restaurants you've visited, towns you've been to ...