The ruins of this Alaska gold mine form a gorgeous ghost town.

A rare chance to get up close and personal with a 13-mile ribbon of ice near downtown Juneau.

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

Gorgeous cave resemble a winter wonderland.

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

This former smelter is a crumbling ruin, with the exception of its towering smokestack.

Since its original beginnings as a weather observatory mountaintop, this facility played an instrumental role in gathering atmospheric data for almost 100 years.

When the big city meets the edge of the frontier, log skyscrapers are born.

The remains of Canada's earliest Chinese pioneers are interred along this picturesque point.

This remote Moravian mission brought Christianity—as well as devastation—to the Inuit people.

This abandoned orphanage-turned-asylum witnessed a terrible chapter in Québec's history.

This notorious Canadian mental institution was home to some of the first LSD experiments and origin of the word "psychedelic."

What was once the largest mine in North America has left behind a hollow hill filled with bright blue waters.

Clusters of abandoned buildings hint at the facility's 144-year history with psychiatric health.

Secret Swing.

The first curved wooden bridge in Canada was built as part of the Alaska-Canada Highway.

Built to supply water to farmers in Alberta, this was once was the world's longest elevated concrete structure.

A marvel of engineering built to prevent annual floods from devastating the city of Winnipeg.

The rusting hulk of a 250-foot-long merchant vessel remains where she grounded on the shore of Hudson Bay.

Beautiful scenery, history, science, and physics come together in this remnant of shipping lore.

This observation tower is a longstanding, 1960s landmark in the Thousand Islands region of Canada.

A crash site in the heart of polar bear territory has become a beloved local landmark.

This "railway" for boats continues a waterway over a road.

Only a few remaining items alert intrepid explorers that a town once stood in this region.