One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

No one knows how many bodies are in this vault in a Chicago public park.

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

Ten acres of the Kula Forest Reserve make up this wonderous state park.

This WWII plane died a quiet death, and is now a garden eel playground.

A controversial memorial at the place where Captain Cook met his violent end.

Submerged lava formations create incredible waterworks.

This museum of Hawaiian and Polynesian culture is the legacy of the last descendant of the Kamehameha Dynasty.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

An unknown number of cholera victims are buried in two nondescript graves.

The large rock formation where the Shawnee prophet Tenskwatawa stood and encouraged his warriors during the Battle of Tippecanoe.

Display that gathers the basic elements of the universe in one convenient location.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

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

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

A medical facility that has been kept frozen in time.

An allegedly cursed tree represents a town's reckoning with a racist past.

The lynching and burial site of America's first train robbers.

One of the richest places in the United States has a cursed street.

Scene of the grisly murder of two Norwegian women in 1873.