We just learned about the US Territory of Northern Mariana Islands.
Another US territory is the island of Puerto Rico, which is just east of Florida in the Atlantic Ocean.

(from: wikipedia - puerto rico)
The flag of Puerto Rico has a blue triangle with a star in it, three red stripes and two white stripes.

(from: wikipedia - flag of puerto rico)
On Flamenco Beach, there are some old rusting tanks that were left there over 30 years ago, and people have painted graffiti on them.

(from: wikipedia - flamenco beach)
There is a fancy old fire station called Parque de Bombas that was designed over 100 years ago to show off at the world's fair.

(from: wikipedia - parque de bombas)
There is a giant telescope called Arecibo Observatory that is over 1000 feet wide.

(from: wikipedia - arecibo observatory)
Kid Facts - Blast from the past: Arizona