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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

A layered tribute to the work of mosaicist Isaiah Zagar.

A glimpse into the lives of the the Miwok and Paiute people in Yosemite National Park.

The trials and tribulations of marking Poe's grave.

A former major munitions plant that has been converted into a sprawling art space.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The water in this preserved area spawns vegetation that gives it a deep green color.

Go inside to really appreciate this 500-year-old technological masterpiece.

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

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The "lovely red Vega" of the legendary record-settling pilot.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A giant Troll lurks under one of Seattle's oldest bridges.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

A museum dedicated to the history and exploration of both popular music and science fiction.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'