Here is the next one on the list and it may be most infamous due to the old prison building that is located there:

4. Alcatraz Island

A small, rocky outpost in the middle of San Francisco Bay, California. Spanish explorer Lt. Juan Manuel de Ayala first mapped the island in 1775 and gave it the name “Isla de los Alcatraces” (Island of the Pelicans) because of the large number of the seabirds that roosted there. It was later home to what is probably the most famous prison in the world and can still be visited today.

There is one on this list that is coming up and you probably have heard of it.  We won’t give it away although this one comment on the thread poses an interesting theory in regards to stone formations:

It’s no big secret that you can burn limestone to lime. If we add the lime water, it becomes a mush, with which you can then sculpt those sculptures. Those who believe that this stone colossi have been carved out of rocks, have absolutely no idea of architecture. The same is true for other historical buildings such as the Egyptian pyramids, Mayan temples, Inca cities, Stonehenge

We’re not sure if he is right.  Enjoy the video!