One man's swirling six-acre monument of stone.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

A 13,000-year-old mastodon skeleton was found during the construction of a 19th-century New York mill.

The original Uncle Sam was actually a New York meatpacker who is buried under this historic grave.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

The first American home of the isolated, egalitarian religion has a trove of Shaker architecture and artifacts.

The small burial plot is located in a mall parking lot.

The narrowest street in Paris.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

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

A poem by Arthur Rimbaud is inscribed on the wall of a street that, while it is only one block long, plays a key role in multiple novels.

This 18th-century sundial was designed to calculate the date of Easter each year.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

The Sun King's military models, saved from the Louvre.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

This museum houses an imposing skeleton army comprised of creatures great and small.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

The oldest continuously operating mint in the world that has been making coins since the 9th-century.

The celebrated eyesore created by starry-eyed sweethearts.

This bridge was constructed from the rubble of the infamous Bastille.