A spooky defunct railroad tunnel now part of a sprawling trail.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

Duluth mineral magnates built this charming art deco lodge to be their private clubhouse.

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

A museum dedicated to the exploring past, present, and future innovations.

When waves crash onto this section of beach, the rocks sing a song.

An architecturally-focused antique shop.

20,000 pieces in a Frank Gehry-designed building.

Half of a waterfall goes into the river while the other half seems to disappear.

This large midwestern cavern features impressive rock formations and an underground waterfall.

One of the best-preserved impact craters on the planet is located in the middle of the Sahara Desert.

This was the first homestead registered after President Abraham Lincoln signed the Homestead Act into law.

Erosion and various mineral deposits give this striking canyon its distinct color and soft appearance.

The easternmost town in Alaska can only be accessed from Canada.

An eatery within the Minneapolis American Indian Center writes colonial ingredients out of the story of Native American cuisine.

Dramatic river bend surrounds a natural red-rocked pedestal.

Fragments of architectural wonders from around the globe are embedded in the newspaper building's walls.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

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

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Quite simply the largest tree in the world (by volume).

Reason for Michigan's potential diamond mine.

The largest tidal whirlpool in the Western Hemisphere.