The oldest operating Mississippi River–style steamboat still navigates the Ohio River.

The pan man stands as a testament to the functionality of American cast iron cookware.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

The "first cat," "first dog," and even a presidential pygmy hippo all get their due in this museum.

One man's lifelong collection of 10,000 rare steins tells the story of beer drinking from 1350 to today.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

The skeletal white beams stand as a monument to religious dissent.

An innovative attempt to break a siege in the American Civil War still scars the earth today.

Memorial stone for GWAR vocalist, depicted in his iconic costume.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

A former Confederate hospital serves as a remembrance of wounded and dead soldiers.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

Rumor has it the uncarved lump behind the three famous suffragists is reserved for the first woman president.

The walls of the iconic dome are hollow and have a secret stairway.

A secret greenspace hides atop a Capitol parking garage.