There’s a hidden military meme engraved on the World War II Memorial.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

National Mall monument to the inventor of the screw propeller.

The Lincoln Memorial has inspired many, even though a word on the inscription appears to be spelled incorrectly.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

One of the oldest of its kind.

Yo, Adrian!

Step into a pastel time capsule where candy is truly dandy.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

Alexander Hamilton’s creation caused quite a bit of controversy.

Believed to be the birthplace of the United States Marine Corps.

An Irish Memorial commemorating those who perished due to potato blight.

Trace the history of the nation’s early days at the site of America’s oldest stock exchange.

A daily replay of the experiment that proved the rotation of the Earth.

This beloved marketplace mascot poops money and grants good luck.

A luxuriant botanical garden below sea level.

This small cottage once fell into Tampa Bay but was rescued and restored.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

This late 1800s historic home was moved by land and sea to serve its current role as a welcome center.