This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The prototype for all Nazi concentration camps.

A pocket of jungle amidst urban expansion in Panama.

An Austrian house of bones filled with hundreds of intricately painted skulls.

It's not quite as old as its Roman appearance suggests, but this piece of infrastructure served Guatemala City for centuries.

The colonial city's social history is reflected in its fanciful door knockers.

In the middle of one of South America's most historic walled cities lies a bar with an enormous collection of Soviet memorabilia.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

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

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

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

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

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 restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

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!

A quiet, gothic haven nestled between Pittsburgh's Squirrel Hill and Point Breeze neighborhoods.

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 restored Pittsburgh house of God has been converted to a marvelous house of suds.

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