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

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

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

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

The oldest continuously operating fish market in the United States.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

The "lovely red Vega" of the legendary record-settling pilot.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

A super-sized promotional trick that is now a D.C. landmark.

Largest Roman Catholic church in North America.

The United States Capitol's former columns still stand.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

A former major munitions plant that has been converted into a sprawling art space.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

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

A warning to the weak-kneed: This narrow bridge does its swinging eight stories high.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

Eight feet in diameter and more than 24 feet around.

While there are no actual snakes in the history of this crooked road, there may be a number of dead horses.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

A hidden barn-sized rendition of Grant Wood's most famous, and most parodied, painting.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.