Giant marble phalluses on the sacred island of antiquity.

The hallucinogenic center of the ancient world.

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

One part antique store, one part curiosities hodge-podge.

The world's second largest single-dish radio telescope, once used to contact E.T.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The world's brightest bioluminescent bay.

Most-visited and most-photographed slot canyon in the American Southwest.

This peculiar lake of pitch is so thick and viscous that one can walk on its surface.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

The home of the Dead Sea Scrolls is an abstract modernist dream.

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

A modern mechanical planetary system, part of a 10,000 year clock.

Home to Hollywood history and a very special salt crystal.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

From the Difference Engine to the Cray-1, all under one roof.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

An enormous, inside-out glass globe built in 1935.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Bouncing, delightful, mechanical art at the MIT Museum.

France's national museum of scientific and industrial instruments.

A reproduction of earth's many biomes.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.