135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

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

Breathtaking and huge 430 year old maps of Italy.

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A mansion where wonders of Christmas are celebrated all year long.

An eerie natural formation that looks right back at you.

After the oysters have been shucked, and the restaurant's been shuttered, the terrazzo sidewalk from the 1940s is all that remains.

In 1857, the Mardi Gras parade tradition began at this intersection.

A unique post-modern public space in the middle of the Warehouse District in New Orleans.

Once the site of a Native American harvest festival, this humble clearing later played an invaluable role in the birth of jazz.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

This 45-story tall abandoned skyscraper is the third tallest building in New Orleans and Lousiana.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

A quasi-futuristic roof sits atop a medieval Bohemian monastery damaged during World War II.