Southernmost Point in the United States
Naalehu, Big Island, Hawaii
Ka Lae, which is Hawaiian for "The Point," is on Hawaii's Big Island, and is as far south as you can go in the United States. The site is wind-blown and wild, far from other tourist draws, though popular with cliff divers.
The Southernmost Point in Continental USA is in the Florida Keys, so it gets more traffic and attention. And it has a gaudy photo op. Ka Lae offers a few random monuments, crumbling ancient ruins, scenic beauty and green sand beaches.