Eccentric concrete mansion and museum designed and built by hand from the inside out.

The only thing better than tubing down New Jersey's scenic Delaware River is doing so while eating a hot dog from a giant floating stand.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

The world's brightest bioluminescent bay.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

Frank Lloyd Wright built this suburban synagogue late in life, but it stands among his most iconic masterpieces.

An Olympic hero stripped of his medals is buried in a town he never visited, which took his name after his death.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

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

An outlandish shoe shaped house built by an eccentric millionaire.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

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

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

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

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

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

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

A prestigious learning institute of old Shanghai.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.