The hippo that stands on this university campus was once a drunken flea market purchase.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

One of the best-preserved medieval streets in Europe.

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

The most radioactive spot in New York City can also fix your muffler.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

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

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.

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

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

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.

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

A nostalgic bibliographic gem.

During Prohibition, the U.S. Congress had an "official" bootlegger, with his own Capitol Hill office.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

This statue of the "father of television" stands prominently in the United States Capitol.

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

Right next to departures—how convenient!

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

The sculptor was instructed to add “stallion attributes” to the general's bronze mare.