The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

This famous city eluded concrete detection until the early 2000's.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Roman ruins top white travertine terraces formed by ancient hot springs.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

This sprawling market is a one-stop shop for traditional Kazakh foods, from mare’s milk to sheep’s head.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

Beatlemania is still going strong... at least in Kazakhstan.

The palatial McDonald's that inspired Wesley Willis.

The original Garfield station is the oldest station facility on the "L", with the station house dating from 1892.

Partially submerged Buddha heads freckle Chicago’s neighborhoods.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

Illegal drag racing two stories beneath Chicago’s streets.

This bronze sculpture on a former squash court marks the secret origins of the Atomic Age.

To find the "unicorns of the deep" you've got to go downstairs.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

This landmark of the Chicago silent film industry may not be in the picture business anymore but it still stands proudly.

This surprising gem is a world-class archeological museum hidden at the University of Chicago.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.