One of the last few period-correct, hand-operated canal locks in the country.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

When ecosystems collide in the arid Southwest.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

A contemporary fresco movement illustrates the region's rich history.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

The largest earthwork effigy in the world.

An office built to look like a giant basket.

This small plaza encourages people diagnosed with cancer to never give up hope.

A gas station has taken the place of the home of the 19th American President.

A monument to a Native American leader who was known for never breaking a promise and met his end after signing a deal with white settlers.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

In the middle of an abandoned stretch of old Route 50 lies a tombstone that weighs three tons.

The walls of the statehouse tell the story of Ohio’s prehistoric past.

Superfans of The Shawshank Redemption can take a driving tour of most of the films real locations.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

All that remains of a gigantic earth-moving machine.