One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

The small first-floor apartment where the author wrote her Pulitzer Prize-winning book 'Gone with the Wind.'

One of corporate America's best-kept secrets is also one of the most publicly displayed.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Large collection from the 3rd millennium BCE.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

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

This former hub for crafty philosophers was founded by a writer who died aboard the infamous RMS Lusitania.

A 19th-century architectural wonder designed by the "father of the skyscraper."

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

A reversed traffic signal that was once violently misinterpreted as a statement on British-Irish relations.

This Art Deco fortress in upstate New York gives Manhattan's vaunted examples of the style a run for their money.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

A Frankenstein blend of science and art allows one tree to produce 40 different types of stone fruit.

An old-timey wax exhibition campily depicting New Orleans legends and scandals.

This relatively recently abandoned brewery is a tragic reminder of the continuing effects of Hurricane Katrina.

After the parade, students throw their beads on the tree hoping for good luck on exams.

Introducing the Green Fairy to her fawning masses.