Not original, or controversial. But the Queen of the World and I went to Monticello and holy cow, the man was a genius.
If you get a chance, you really should visit his home in Charlottesville, Virginia. Do NOT miss the museum there, which describes which architecture books or classical buildings he took ideas from. The dome is from the Temple of Vesta in Rome, but he had to adapt the design to his existing house which made the dome slightly longer on one axis. Jefferson used trigonometry and pencil-and-paper calculations (to 1/100,000 of an inch!) in his detailed design.
I was impressed in how he designed systems to channel rainwater away from where it otherwise might pool and cause rot. It's very ingenious. He also had a document copier, and corresponded with Eli Whitney about Whitney's patent application for the cotton gin. Reading the letter gives a sense of his unbridled curiosity.
More travel pictures later, but if you are anywhere nearby, this is worth a detour.