The fossilized remains of ancient California redwoods.

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

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Earth's greatest purely vertical drop at 4,101 feet.

Macabre astrological automaton clock dating to the late 1400s.

100 year tradition of fist fights, marked by marble footsteps.

Breathtaking and huge 430 year old maps of Italy.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

An underground city of salt.

Collection of vintage trailers double as hotel rooms.

A reproduction of earth's many biomes.

America's only nuclear missile silo open to the public.

The world's largest military aircraft cemetery.

A trash dump made beautiful by nature's power.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.