The Tuileries is a very manicured garden that sits between the Louvre and the Place de la Concorde.
It was the site of a grand palace in the 16th century, which was eventually destroyed and demolished in the 19th century. The park lands were once private, but became a public space after the revolution.
On the Western end of the Gardens is the Place de la Concorde.
There is a giant obelisk from Egypt in the center or the square called the Obelisk of Luxor. This was previously a bloody site of countless public executions; a guillotine placed here during the revolution was the end of the road for royalty such as Queen Marie Antoinette and King Louis XVI.
Now, it's a great place to dodge 12 lanes of traffic.