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

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

This historic old movie house was the scene of one of the Blob's most iconic attacks.

This dramatic rail curve was once the target of a failed Nazi attack.

A local prank turned town icon.

This elaborate towering structure was once famed for its revolutionary height.

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

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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

Century-old shop, specializing in Occult products.

A daily replay of the experiment that proved the rotation of the Earth.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

Yo, Adrian!

The first American department store, and home to the largest operating musical instrument in the world.

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.