A monument to the art of slicing people open.

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

This shop for all your super spy needs hides an educational secret.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

This giant green head remembers one of America's jazz giants.

This recently restored timepiece has stood all around Kansas City.

This Italianate Villa-style castle is pretty to look at, just keep off the private property.

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

These free-roaming horses were once destined to disappear from the land.

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

The oldest continuously operating fish market in the United States.

A tiny monument to the classic American candy.

The system of air guns are fired off remotely to scare any trespassing avians.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The romance of early commercial flight still fills this Art Deco destination.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Right next to departures—how convenient!

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

D.C. once had its own tiny rival to the New York Stock Exchange.

A line of blue paint marks the route of the inaugural parade.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.