A wall of chewing gum moonlights as collective art.

A walk through the historic city center, under the streets of Seattle.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A tunnel with windows, so you don't miss out on the impressive views.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A sharp bend in a dramatic river canyon cut through red rocks.

See massive fossils that are over 200 million years old in northeastern Arizona.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

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

Lie in a hammock where George Washington stood.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Yo, Adrian!

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A layered tribute to the work of mosaicist Isaiah Zagar.

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

Rare recess caves fill this unbelievably beautiful Ohio park.

The mounds at this site were reconstructed with the help of archaeologists and historians.

This handcrafted, old western-style town is filled with deserted cars, retired movie props, and other forms of Americana.

This kitschy tavern is also home to rare early editions of "Treasure Island."

Local myth claims this is a Sears catalogue home with its windows installed upside-down.

A monument to Cuffy, a rebellious enslaved person who became a national hero in Guyana.

Georgetown’s most impressive building is also one of the tallest wooden churches in the world.

Though dynamited and defaced, the statue still stands outside the law courts in Georgetown, Guyana.