Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

South Korea's largely symbolic, barely used gateway to the North.

A remnant of Korea's colonial past lies forgotten in a hip neighborhood in Seoul.

The world's first cruise ship-shaped hotel is perched atop a cliff.

Secret North Korean passage discovered below the world's most dangerous border.

Pilgrimage site for star-crossed lovers.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

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

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

Traditional 15th century Chinese garden in the middle of Vancouver.

Little island known for its massive beachfront "flowerpot" pillars.

One of the world’s largest living advertisements is made out of pine trees.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

The world’s largest Masonic temple was saved by the White Stripes.

A Beaux-Arts triumph set to become Ford's innovation campus

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

This resort community was known as the "Black Eden of Michigan."

An unlikely beach paradise of giant sand dunes lies between two lakes just a few minutes from Michigan's cherry country.

On the shores of Lake Kalamazoo, a plaque marks a fictional event where an island nation ran aground.