A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

The remains of a bustling turn-of-the-century park built to showcase the wonders of electricity.

This remote island in Iowa was abandoned after being devastated by flood.

This odd-shaped relic from the 1964 New York World's Fair found its way back home to Wisconsin.

These molds for fiberglass statues have formed an eerie, accidental sculpture park.

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

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

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

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

The only arched bridge made of stone on the entire Mississippi River.

This lab's maddening silence is good for business but bad for sanity.

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

Hub of Scandinavian culture in a Minneapolis deli.

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

This simple home was the beginning of a long journey for the iconic Western film star.

Find out what it sounds like when doves cry at Prince's recording studio estate turned museum.

A small burial plot formerly stranded in the middle of a road.

Largest gathering of hobos in the country has been meeting annually since 1900.

A winged-helmed, sword-brandishing tribute to German Americans.

A roadside collection of over-sized iron creations that are a bit more macabre than most.

One devoted couple has donated multiple recreations of Michelangelo's sculptures to this South Dakota town.