Dr Barnes' $25 billion private collection of art and arboretum.

A layered tribute to the work of mosaicist Isaiah Zagar.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The world’s first penitentiary, meant to be humane, drove men insane.

A Civil War Museum with some notable medical antiques.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

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

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

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

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

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

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

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

It’s not hard to see why the historic Peabody Conservatory of Music’s library has been described as a “cathedral of books.”

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

This museum devoted to the gothic author holds such interesting ephemera as his socks and walking stick.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

Brain collection and database that narrows the gap between man and animal.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

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