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

This "Palace of Purification" has made many film appearances as a dark and sinister headquarters.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This replica of the Greek structure is in the heart of Nashville.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

An urban laboratory.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

America's most famous piece of self-built architecture.

The legendary building that needed ghostly approval before being built.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

World's first "penitentiary," meant to be humane, drove men insane.

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

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

Canada's accused-traitor-turned-folk-hero is buried under a red stone in a ring of his own.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

This engineering marvel is the longest bridge in Canada and one of the longest spans in the world.

Roadside tribute to a staple of eastern European cuisine.

A mysterious spot where the laws of gravity seem not to apply.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.