A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The birthplace of a titan of American cinema.

What was once the second largest steel mill in the US is now a sprawling complex of modern ruins.

In the middle of Calvary Cemetery stands this singular memorial to a small boy who died too young.

A strange rock in Chicago marks the spot where a tree once stood in honor of the 18th President.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

What was once one of the country's largest confectionary plants is now an abandoned ruin, but is still pretty sweet.

A chance to follow in the footsteps of the word's most legendary animator.

This small, but long-running hobby club has built one of the largest model rail lines in the US.

Landmark Chicago building narrowly avoided destruction.

This bridge was constructed from the remains of the first Ferris wheel.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

The crumbling remains of a 19th century fortess.

This strange example of the Egyptian Revival architecture trend now holds Mardi Gras floats.

Before becoming a public park, this spot was a shell midden, a fort, and an amusement park.

A prime example of New Orleans' unique architecture these early 20th century homes were built to look like steamboats.

A house of courtship where the Jazz Age's most storied lovers got their start.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

A crumbling hospital from the 1850s on Roosevelt Island.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.