A spectacular tribute to statesman and philanthropist Andrew Mellon.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

The National Park Service’s best-kept secret with views that rival any in D.C.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

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.

This groundbreaking 16th-century map is known as "America's birth certificate."

This lovely pocket park is one of the most under appreciated in D.C.

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

Now a living classroom, this house was once the home of Reverend James Clinton Dent, a formerly enslaved man and a pastor.

A super-sized promotional trick that is now a D.C. landmark.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

A striking memorial to the 21 lives lost in an explosion at the Washington Arsenal

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

This hidden, women-built-and-operated Nevada temple on Shoshone Native American land is dedicated to the Egyptian lion goddess Sekhmet among other goddesses.

The helicopter that "Tricky Dick" absconded from the White House in on his last day in office.

A museum dedicated to restoring vintage aircraft, located at a working airport.

Colorful sedimentary rock layers provide opportunities both for hiking and photography.

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

One of the largest open-pit copper mining operations in the entire country.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

The outcropping is graffitied with the name of the beloved musical Muppet television series.