A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

France's most famous cemetery, with some of its most curious tombs.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A small island hides in plain sight on Austin's Lady Bird Lake.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This failed condo development was reborn as a street art hub.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

Just like the real 36th president of the United States, animatronic LBJ amuses visitors with jokes and stories.

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

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

The front yard of an Upper East Side town house hides the last fragment of one of New York's most famous theatres.

A cult following celebrates the legend that belies this curious podiatrists' office sign which has worked its way into song, literature, animation, and the visual arts.

Pay your respects to a folk-punk legend.

This hilltop park offers magnificent views and a Frank Lloyd Wright masterpiece.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

Stroll the grounds built by murder, suicide, and dirty oil money at one of Hollywood's most filmed mansions.

An ultra-modern vista that has been featured in so many films the house is a celebrity in its own right.

This traditional garden in the San Fernando Valley doubled for Star Fleet Academy, and is irrigated entirely by wastewater.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.