This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Over a million items cram the shelves at Africa's largest shop of used and rare books.

A "miracle" that seems to produce more holy fistfights than holy revelations.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Quito's historic, main square dates back to the 16th century.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Ancient Manuscripts showcase the civilization of West Africans during the Middle Ages.

One of Western Africa's oldest mosques, this Timbuktu icon has stood for nearly 700 years.

Huge abstract sculptures of the Puerto Rican Flag.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

A beloved Chicago music venue offering cold beer and lots of “Friendly."

A hot dog stand where the heads are just as hot as the dogs.

A display of magnificent stained glass windows is the first exhibit of its kind.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Years of archaeology, just chillin' by the water cooler.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.