This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

Gorgeous cave resemble a winter wonderland.

The ghostly remains of what was once the world's richest copper mine.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

The king of U.S. high points towers over every other peak on the continent.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

This whimsical stacked cabin looks like something out of a children's book.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

Home of the only civilian casualty at the Battle of Gettysburg.

A private residence adorned with a gorgeous mural dedicated to the buzzing insect.

Just outside the Ohio Supreme Court sits a testament to justice.

Tucked away in a corner of a Maine general store there was a museum devoted to an equally beloved and reviled local soft drink.

On Hurricane Island, a former ghost town has been transformed into a forward-thinking research center.

A mural of a boy making a phone call connects a southern Maine community to a town in Iraq.

Plaque remembering the 18th century forced relocation of Acadians.

This 90-year-old building is home to possibly the most New Englandy social club in existence.

Every plane, auto, and bicycle in this collection is kept in working order and are regularly demonstrated to the public.

A restored historic movie theater is the perfect place for a regional film archive.

As communication goes completely wireless, this Maine museum remembers all the wires that got us to this point.

A charming museum of natural history featuring dioramas and exhibits made entirely by college students.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

This massive solar system model is sprawled out across Maine's suburban wilderness.