A spectacular tribute to statesman and philanthropist Andrew Mellon.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

A celebrity from the late Cretaceous period.

The "lovely red Vega" of the legendary record-settling pilot.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

Home to the organ played at General MacArthur's funeral.

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

Once the site of the Hawaiian monarchy, this building was originally designed as a palace.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

A collection of vehicles across American military history.

Giant busts of 42 U.S. presidents sit, crumbling in a field in Virginia.

These trees are living witnesses to events that inspired poet Walt Whitman’s service during the American Civil War.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

An overgrown garden stands as a grim marker of an unrealized dream.

Dedicated to the victims of one of the deadliest hurricanes to strike the United States in recorded history.

This lush Florida island is home to the ruins of a crooked ship breaker's tiny empire.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

A historic landmark and museum filled with curious objects representing the history of Key West.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.