A treehouse assailed by the elements and the government, now gone.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

These curious caverns have been home to mushrooms, gangsters, and disco.

Each of these 87 large stones has a unique message. Together, they form part of the Minnesota Military Family Tribute.

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

A nerdcentric group and creators of the Nerd Prom.

Terraced flowerbeds and rock sculptures in the midst of the Minnesota wilderness.

This vintage "streetcar boat" lay at the bottom of Lake Minnetonka until the 1980s.

A fence constructed completely of skis on Monroe Street.

A futuristic climate change study is nestled deep within this public land.

Thousands of majestic trumpeter swans fill this park, sounding distinctly like a certain brass instrument.

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

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

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

An amazing collection of sculptures and art.

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.

Elaborate drama imparts an appreciation for 19th century hardships.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

A riverside park built around the ruins of a massive dam that collapsed in 1909.

A Perpetually Under construction Park.

A mapping error in the 19th century made loggers think this section of the forest was underwater.

This bright yellow building is packed with sweet treats from all around the world, from chocolate-covered crickets to whoopie pies.

The remains of a World War II munitions factory still haunt the fields of this Twin Cities suburb.