These abandoned salt flats are now a haven for wildlife.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

Elevated freight railway turned wildly successful urban park.

Gladiators once walked this ancient, subterranean passage.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Legend says this sacred tree was a gift from goddess Athena.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

These ancient ruins hide in plain sight next to a dessert shop.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

This statue honors the author's groundbreaking family story.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

A historic Montreal market that was the city's agricultural hub for over century.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

Few other hotels can rival the grandeur of the Castle in the Rockies.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.