These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A spectacular cave and a beguiling lake.

Ancient Greek oracle of the dead.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

The hallucinogenic center of the ancient world.

This legendary city has been a tourist attraction for centuries.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

A trash dump made beautiful by nature's power.

The second-largest ceremonial mound in the United States is an artificial hill that is loosely shaped like a pentagon.

A small but industrious mining operation that allows visitors to touch precious gems while they are still in the rock.

Eclectic collection of rare and beautiful stones in a historic home.

Reason for Michigan's potential diamond mine.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

The world's first ice hotel is still one of the most elaborate and beautiful.

According to the locals, the sands of this secluded Norway beach are infused with gemstone particles.

This orchid sanctuary protects countless varieties of the flower, from the huge to the microscopic.

A small Denmark town displays a pair of titanic jaw bones as their community symbol.

The house where John Wilkes Booth conspired with his co-conspirators.

Eight feet in diameter and more than 24 feet around.

17,400 lbs., 12 feet in diameter, and 29 years in the making.

Elaborate drama imparts an appreciation for 19th century hardships.