A submerged archeological park still holds the wonders of a Roman Sodom.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A 16th-century horror show built in a lovely Italian garden.

One of New Jersey's oldest churches is a historical treasure trove.

Seven people are buried in the middle of what's now a movie theater parking lot.

This massive boulder is either a unique rock formation created by glacial melt or a magic energy vortex.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Burial mounds of prehistoric Native Americans who lived along the DuPage River.

The first and only museum dedicated to stained glass and horology opened outside of Chicago in 2017.

A small abandoned and abused cemetery that has become a magnet for ghost hunters.

The mysterious white squirrels of this Illinois city are treated like sacred cows.

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

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

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

Deep scars on the earth left by the Ice Age.

Hidden behind an empty field resides this early 19th-century cemetery.

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

This historic furnace was once used to produce cannonballs during the Civil War.

This massive sycamore tree has been labeled as one of the largest in the state.