Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

This shrine to McDonalds' most iconic sandwich holds a 14-foot tall burger.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

World War II bunker still standing on the New Jersey beach.

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

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.

The only arched bridge made of stone on the entire Mississippi River.

One of two giant blue cockerel statues erected with an intentional double meaning.

When flour explodes, it's not a pretty sight.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

This striking art museum holds an amazing series of curiosity cabinets.

A place to eat for on-the-run agents and espionage enthusiasts.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

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.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Washington's iconic carousel has a nice piece of Civil Rights history.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.