A lush green oasis in the middle of Chicago.

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

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

This historic hotel invented the chocolate brownie.

The final resting place of soldiers' loyal canine companions.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Protecting the dead from opportunistic body snatchers.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

The most loyal of little dogs, or a Victorian era publicity stunt?

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

A sharp sculpture made of thousands of pieces of jagged glass.

An ancient Greek monument and a Byzantine church coexist inside this cave.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

One of Ireland's most infamous prisons for rebels including men, women and children.

A stunning Victorian abbey and walled garden on a lakefront.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Ice cream stand, snack bar, and time capsule of milk conveyance.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.