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

Built in 1931, this small passageway is believed to be the first modern skyway.

This statue of Olympic hockey coach Herb Brooks immortalizes one of the greatest moments in American sports history.

After the musical legend's death, his memorial was mysteriously graffitied in gold.

This double-arched masonry highway bridge is the only structure of its kind in Minnesota.

This old residential building was once the largest flour mill in the world.

This water tower has been a staple of the Rochester skyline since 1931.

Downtown Minneapolis mixed art and function by turning some of their sewer covers into works of art.

This kaleidoscopic mural shows Bob Dylan throughout his transition from young troubadour to Nobel laureate.

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

This massive roadside mascot was the first version of the giant to illustrate his butt.

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

Perhaps the oldest vine in North America, this sprawling plant helps make a sweet wine.

The lesser-known lost colony of Roanoke was a safe haven for formerly enslaved people during the Civil War.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

This statue intended for children to enjoy became a minor political spat.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

What may be Boston's finest Art Deco building, located in the city's Financial District.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This supermarket is suspended 25 feet above an interstate highway.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This beautiful architectural gem was the first waste treatment facility in Boston.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.