This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

There aren't too many operational funiculars around, but Pittsburgh has two!

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Decades before the scandal, this staircase on the river was a literal "water gate."

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

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

Washington's iconic carousel has a nice piece of Civil Rights history.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Founded by the famed children's book artist, this museum spreads an appreciation of the arts through picture books.

Life-size bronzes of the Grinch, Cat in the Hat, Yertle the Turtle, Sam-I-Am, and the Lorax—and the author himself.

Memorializing an American tragedy of massive proportions.

Steepest flood safety railway in the entire world.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The Dover International Speedway is home to a towering, concrete-skinned, racecar-hungry behemoth.