One man has spent decades faithfully constructing this unique brick and cinderblock castle.

This tombstone marks the final resting place of the beloved 1990's character, Ernest P. Worrell.

The writing studio of an American adventure author, built in the style of a medieval castle.

For more than 50 years, an iconic sign has greeted visiting “fudgies” to the Traverse City area.

This vacant station is a relic of harvest processing techniques of the mid-20th century.

These early tent-shaped grave coverings are unique to Appalachia.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

This structure among the trees was the result of divine inspiration.

The first KFC is on the National Register of Historic Places.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Live long and prosper in Tennessee.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This building contains handprints that are well over a century old.

A unique botanical garden housed in three giant geodesic domes.

An arresting temple full of mosaics as colorful as the politician they memorialize.

The longest enclosed pedestrian bridge in the world spans 14 lanes of traffic and six rail tracks, all while lighting up the night sky.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

An architectural marvel built by a nearly forgotten Canadian Quaker sect, the Children of Peace.

A school teacher's massive and terrifying self-built castle.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This uniquely shaped tombstone is dedicated to the project construction superintendent for the Empire State Building.