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.

The walls of the iconic dome are hollow and have a secret stairway.

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

A line of blue paint marks the route of the inaugural parade.

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.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

It was once the base for a series of domestic terror attacks.

Home to items never before seen by the public.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

A little sculpture with a large wardrobe.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This bridge was constructed from the rubble of the infamous Bastille.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

A mile-long audio-guided walking tour preserves an iconic era of Portland soul music.

According to legend, this rock represents a young girl trapped by an evil ocean spirit.

An out-of-the-way state park in Oregon that features both a picturesque waterfall and the ruins of a hydropower plant.

The oldest restaurant in Portland serves fiery coffee cocktails and an astounding amount of turkey.

This theatre and its amazing marquee harken back to the Golden Age of Hollywood.

Tens of thousands of tiny birds swarm into one school chimney every fall.