The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Did Inca children also slide down these smooth rocky slopes above Cusco?

A typical "Old South" manor, once owned by author Anne Rice, served as the setting for several of her witchcraft sagas.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

A prime example of New Orleans' unique architecture these early 20th century homes were built to look like steamboats.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

The modern birthplace of Irish freedom.

The fifth-longest natural arch in the world, and the longest outside China.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Legend has it a commoner volunteered to be buried alive in the foundation so that the great fortress could be built.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

The World's Largest Bull.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This famous city eluded concrete detection until the early 2000's.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

The oldest continuously operating fish market in the United States.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.