This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

The largest library in Latin America owes its existence to an Old World earthquake and a Napoleonic invasion.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

Two small markers remember the Alamo's feline protectors.

These red marks, seemingly placed at random, are in fact not.

A Stalinist prison camp for the wives and children of men accused of betraying the Soviet state is now a memorial museum.

An abandoned horror film set sits eerily along a highway through Hollywood's "door to the desert."

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A tree seems to grow from the ocean floor on this strange strip of sand slowly being overtaken by the sea.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

The sunken structure looks like the victim of a catastrophic flood.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

A collection of intricate sculptures so small they have to be seen through a microscope.

A simple tribute to the microscopic arachnid that gives its juices and its life to help make a speciality German cheese.

The narrowest house in Buenos Aires is less than 10 feet wide.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This wooden hotel is a temple to German sustainability and forest conservation.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

A wunderkammer of exoticism immortalized by Tom Waits.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

Wax models of disease and deformity are on display at this German medical museum.