The tunnel under the Capitol Building where Congress takes out its trash.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

There just so happens to be a court even higher than the U.S Supreme Court: a basketball court in the building itself.

A fantastic array of trays and cables once whisked books over to the Capitol at 600 feet per minute.

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

A nostalgic bibliographic gem.

100 years later, they're still down there.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

A street in front of NASA's D.C. headquarters has been named in honor of the Black women who were essential to early spaceflight.

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

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

Home to items never before seen by the public.

An obscure public service from the U.S. government that redeems burnt, moldy, and soiled old greenbacks.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

One of the best-selling bar bands in American music history is commemorated in their hometown's Five Points neighborhood.

The world's largest fire hydrant is supposedly tornado-proof.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

An 83-foot tall granite obelisk honors the legacy of Dr. King in the heart of Norfolk's Black community.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

A glimpse into the sacrifices of military members during World War II.

This site in Caldwell County is the location where the Cherokee and Catawba are said to have entered a peace treaty.

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.