Rippling sand dunes frozen in the Arizona rock.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A closer look at this somewhat faded hotel by the Corinth Canal reveals the architectural undertones of a genius.

This quaint farm in the Peloponnese countryside hides an astonishing cache of antique curiosities.

This Greek cinema was architecturally inspired by Mussolini's vision of a fascist Mediterranean utopia.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

This graffitied 19th-century building was a prototype of European industrial architecture.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

An abandoned Byzantine fortress and notorious prison.

Poseidon? No one seems to know.

An alien landscape on the banks of the Aegean Sea.

This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Monasteries on rock pillars, once accessible only by frayed ropes.

The largest greenhouse in the world is home to over one million types of plants.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.