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

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

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

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

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

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

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

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

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

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

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

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

The last remnants of Fort Pitt also hold the distinction of being the oldest structure west of the Allegheny Mountains.

A model of a dinosaur that was named for Andrew Carnegie stands outside the museum that also bears his name.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

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

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This permanent exhibition celebrates the finest of our heartless automatons both real and fictional.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.