I would have to go with the Red wood forest.

Movie poster for Disney's latest failure, "Honey, I Started Shrinking Random People"

Yup, correct! It is in the Sequioa forest of California. That tree was turned into a tunnel but it started to rot after a few years and was deemed unsafe.

THAT'S the worst possible place to build a lighthouse.

This is a retreat in South Carolina. If you look closely you can see that the top is actually a house. Was built without phones or anything so that anyone there would be in peaceful isolation.

Photo #8

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Monarch butterfly migration. Every year millions of the little buggers fly down to Mexico to work on their tans and drink margaritas.

Grandma really needs to shave her legs...

Ann is absolutely correct! Two thumbs way, way up!

CERN, the inside of a particle collider?

In side a power plant?

Inside a building made entirely out of yellow LEGO© blocks!

Those are good guesses, but actually, it is the tunnel leading to the Lost Sea in Tennessee. It is a very, very large lake underground where there are boat tours with glass bottoms to see the eyeless catfish that swim there. This tunnel is like a quarter mile long to get there, but worth the walk.

It's where they accidentally spread Miracle-Grow instead of some bug killer. It seems forest-like so maybe it's South America? (Botanyphilia..? A crysanthemum hooker maybe?)