This Florida resort community is where the Amish come to have fun in the sun.

Bison, America's national mammal, are staging a slow comeback in Ohio's prairie parkland.

An office built to look like a giant basket.

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

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

The oldest farmer's market in America is so ancient it was approved by the King of England.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

2300-year-old Roman road connecting the empire.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

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.

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

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Single runway interrupted by a busy road that cuts across its middle.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

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