Place de la Concorde at the end of the Tuleries Garden is a huge area. If you cross it, the Champs Elysees starts and continues on to the Arch de Triumph-a long walk.
The Egyptian Obelisk, the oldest object in Paris. It was a gift from Egypt after a Frenchman was the one to discover the meaning of the Rosetta stone so Egyptian hieroglyphics could be interpreted. Or maybe it was just one of many art object Napoleon brought from Egypt. I also heard that Josephine said to Napoleon before he left for Egypt to bring her a “little” obelisk from there and that this was what was the result. It was, as you might imagine, a huge undertaking to get it down the Nile River and up the Seine to Paris and then to put it in place.