When the Ob River was dammed up in the 1950s to build the Berdsk Reservoir, much of the old city of Berdsk was submerged, and some villages, too. I've been working in Berdsk this year! Here are some maps. I found the first one here.

I recently found out that Daniel Boone's Wilderness Road goes right by my house in Virginia!

The check that bought Alaska and the Apollo 11 flight plan, also via the U.S. National Archives and Records Administration.