Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This punny mirror of another Wisconsin attraction is exactly what it sounds like.

A place to eat for on-the-run agents and espionage enthusiasts.

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

A brick-paved former section of the historic coast-to-coast highway.

This erect, phallic geological spire wasn't always named so domestically.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

A four story, football field-sized, nine-grotto creation made of shells, minerals, and rare stones.

This zombie-themed restaurant stands out in the heart of corn country.

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

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

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

Where the notorious gang lived while on the run from the FBI.

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

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

One of two giant blue cockerel statues erected with an intentional double meaning.

Sleepy Minneapolis block beats Guinness Record for most churches on one city block.

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

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

This Minnesota-shaped forest is actually located in the state it is shaped like.

A Museum Dedicated to the Heroes That Fight Fire.