The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The highest point in Washington state is a volcano covered in glaciers.

The highest peak in the state of Vermont has some interesting features.

As state highpoints go, this spot is one of the lowest, but for years it was also the hardest to climb.

This highest peak in New Mexico is named after an explorer who had a habit of lending his moniker to peaks.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Inspiring Herman Melville and Henry David Thoreau, Mount Greylock in western Massachusetts is the highest point in the state at 3,491 feet above sea level.

The highest point in Louisiana, Driskill Mountain at 535 feet above sea level.

The highest point in Maine is a grand gift to the state citizens that also happens to be one end of the Appalachian Trail.

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The highest point in Connecticut was incorrectly memorialized before surveyors discovered the actual spot.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

The king of U.S. high points towers over every other peak on the continent.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Plaque commemorating the location of a underground nuclear bomb test in the 1970s.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The remains of a deserted 1800s farming community can be found in Little River State Park.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

An enormous factory from the late 1800s sits abandoned on Cleveland eastside.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A crumbling hospital from the 1850s on Roosevelt Island.

Odd outsider art installations surround a Gold Rush-era ghost town.