Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The only road through the heart of Glacier National Park.

The first declared National Monument in the United States.

This huge clock made of flowers and simple machinery was once used a political weapon.

This grave marks the final resting place of a legendary frontiersman... unless it doesn't.

Elaborate drama imparts an appreciation for 19th century hardships.

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

Half of a waterfall goes into the river while the other half seems to disappear.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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.

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

Perhaps the most scandalous statue of America's first president.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

Go inside to really appreciate this 500-year-old technological masterpiece.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A saintly relic hidden in a Prague church basement.

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.