An ornate and disused early 20th-century building has been given new life as a fully operational structure, complete with offices, oyster bar, and a furniture retailer.

This small, ingenious cannon once helped regulate Parisian life.

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

This outdoor gallery of sculptures along the East River was once a landfill.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

This lesser-known Frank Gehry building houses a treasure trove of cinema history.

A short distance from the Eiffel Tower is the final resting place of several of the city’s more well-known and interesting characters.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

A century-old magnolia tree is the only living landmark tree in New York City.

This Upper East Side apartment co-op was designed as a tuberculosis sanitarium.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

Harlem park dedicated to compulsive hoarders killed by their own junk.

A posh members-only club with a literally dramatic history.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

This museum shines a light on the true Pilgrim experience in North America.

The site of a fallen tree that protected Americans from British forces during the American Revolution.

This conservation area is also home to many of the region's desert tortoises.

This elaborate tunnel is the first structure composed of cast concrete in the United States.

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.