The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

This historic Ohio bridge is adorned with fanciful locks left behind by loving couples.

Indiana's shrine to the sport that has become a hallmark of their culture.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

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

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

The home made famous by the 1983 holiday classic is now a perfectly preserved shrine to the movie.

The charming collection celebrates a small Ohio village's Finnish roots.

A monument to the “unrecognized dead” of the tragic 1876 train crash.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

The headquarters of a pioneering cast iron and cast aluminum cookware company is in ruins, but still standing.

A 30-foot stack of piano keys memorializes one of the greatest keys players in jazz history.

A jukebox headstone marks the grave of the Cleveland disc jockey credited with coining the term “rock 'n' roll."

A gas station has taken the place of the home of the 19th American President.