If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Meet cowboys and ancient beardogs at this one-of-a-kind crossroads of Western history.

These five houses were built for the 1933 Chicago World’s Fair.

With a history dating back to Victorian times, this architectural gem is a rare New York tourist haunt worth visiting.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

This small hill features the most notable collection of petroglyphs in Saguaro National Park.

Hawai'i Volcanoes National Park is home to one of Polynesia’s largest petroglyph fields.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

Why have you never heard of the second most popular tourist site in New York?

The first transatlantic wireless communication between the U.S. and Europe took place here in 1903.

A striking geological formation in Southern California.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

"Only the devil could play golf here."

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

This crumbling Death Valley mining complex was known for its use of giant, 20-mule team wagons.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

This rusting remnant of the local herring industry is being given a second life.