This unique depiction of the Virgin Mary may be the tallest kinetic art sculpture in the world.

Once considered a marvel of engineering, there are now doubts about the structural integrity of this 5.4-mile cable-stayed bridge.

The world's tallest slum.

This "floating island" plateau sits 7,671 feet above the forest floor.

This everlasting lightning storm may be the world's largest generator of ozone.

This quirky local sculpture is quite literally a fish out of water.

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

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

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

Home of an evil witch famous within southern folklore.

Enormous lake at the bottom of a unique cave system.

Known as the "Finger of God," a dramatic rock formation resembles a divine hand extending towards the heavens.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

The institution is sitting on a goldmine of 21,000 paints, varnishes, pigments, and primers preserved for posterity.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

A nostalgic bibliographic gem.

The walls of the iconic dome are hollow and have a secret stairway.

World's largest collection of Coke-related items not held by the Coca-Cola company.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.