The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

The two writers famously didn't come to blows over the Oxford comma.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Every drop of D.C. tap water flows through this old waterworks.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

“The oddest pub in South Africa,” inspired by a practical joke.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

The "Seinfeld" diner.

After covering almost 1.5 billion acres, the survey's still not finished.

A unique museum tells the story of the day-to-day life of World War I soldiers.

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

This sky-high radio mast is formerly the tallest man-made structure in the world.

In addition to fine dairy products, the world's most beautiful milk shop also offers a feast for the eyes.

This working class sculpture pounds his hammer all the livelong day.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

Possibly the world's oldest rug, this Egyptian relic is woven entirely from ancient cat hair and once carried a mummified human foot.

A lion given to the prime minister somehow got stuffed and sent to Florida.

A Yale University president wears full samurai garb in one of America’s oldest cemeteries.

A life-sized mammoth sculpture marks the spot where the remains of a Columbian mammoth were discovered in 2005.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

A comic book store got the road by its shop officially renamed after Superman's girlfriend.

At this California chicken ranch, four bucks will get you 18 eggs and a chorus of dancing animatronic poultry.

This modernist tower was saved by a fraternity with a 500-year-old penchant for shooting at wooden parrots.