Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

America's first federal monument.

The narrowest house in America is seven feet of pure spite.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

This historic boathouse was constructed using salvaged lumber from burned barns.

Surrounded by a verdant garden and a backdrop of ivy, a monument to beloved poet Khalil Gibran stands outside of the Lebanese embassy.

The 28,000-year-old specimen is remarkably intact.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Largest Roman Catholic church in North America.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The site of the climactic scene from the classic horror film is now a historic landmark.

The United States Capitol's former columns still stand.