This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

The oldest playground in America.

Beautiful steampunk ghosts of early Massachusetts.

Salute the leader of the proletariat.

The oldest surviving synagogue in New York City is now a soaring art space.

New York City's only radical feminist independent bookstore.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This tribute to the founding father of the American dictionary originally contained a spelling error.

Reminders of the Battle of Berlin still scar the railway.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

Commonly acknowledged as the only public monument to the Devil himself.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A slice of central Asia in the middle of Berlin.

Once considered a marvel of engineering, this 107-mile canal played an integral role in building New York City.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

On the Hudson resides one of the largest clocks in the world.

This evocative New Jersey statue memoralizes the Polish victims of a Soviet massacre.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

These whimsical works of art tell the story of the city's past and present.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

This historic patch of real estate offers a glimpse of colonial Boston.