This was once the largest four-sided clock in the world (yes, even bigger than Big Ben).

This rooftop sign has been confusing Milwaukee-bound airline passengers for decades.

A trailblazing sovereign nation tucked in the American state of Wisconsin.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

An outdoor urban gallery of large-scale artworks by the world's most influential street artists.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

This two-room shotgun shack in Tupelo is the birthplace of a King.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

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

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Historic Hull Street was actually the first street with a proper name in the Boston area.

The site of Paul Revere's historic two lantern warning.

Two thousand artifacts from around the world collected by one woman who loved to travel.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

There must be a pun in this haystack somewhere...