Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

These spartan apartments are provided to clergymen visiting Vatican City.

Breathtaking and huge 430 year old maps of Italy.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

An eerie reminder to the horrors of World War II.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Peace Park and the Atomic Bomb Dome.

A beautiful bamboo trail tucked in this famous Japanese shrine.

This 700-year-old street food market features baby octopus and soy donuts.

The best-preserved example of a unique structure in Nubian architecture.

Every Friday, Sufi dervishes whirl around the tomb in a trance-like state as part of a sacred ritual called dhikr.

Crumbling pyramids and temple ruins stand within the shadow of this sacred butte.

These Nubian pyramids are strange and unique, even by pyramid standards.

The fighters and conspirators that won independence for Paraguay held secret meetings at this historic house.

An underexplored, 130-foot tropical waterfall that you will have all to yourself.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Currently housing a corporate bank branch this building at the southern tip of Manhattan was once the gateway to luxury vacationing.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

The first piece of public art dedicated to LGBT rights.

New York City's smallest piece of private property.

Those belting out show tunes in this West Village piano bar might not realize it marks the site where Thomas Paine died in 1809.

Phil Mortillaro uses keys to bring art back to the Village.

This slender three-story building has also had several famous residents.