Herbert Hoover is the only president to have an asteroid named after him. It was called Hooveria, and the reason it’s not on my asteroid list is because I don’t know of the asteroid number.
The first U.S. national monument was Devils Tower in Wyoming named by Theodore Roosevelt in 1906.
None of Franklin Pierce’s children was alive to see his presidency (3 children).
Mount Vernon, George Washington’s home, was named for the original landowner, Vernon Washington.
President James Buchanan was a gracious host. When the Prince of Wales visited the White House in the fall of 1860, so many guests accompanied him, there weren’t enough beds. The story goes that the president decided to sleep in the hallway.