A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

One of the newest mosques in a city filled with thousands.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

A surprising and unconventional mosque hidden in the subsoil of Istanbul.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

A small alleyway lined with locally drawn scenes of nostalgic anime and cartoon characters.

View Kentucky's beauty and history from the perspective of painter John James Audubon, author and illustrator.

A tribute to a 13-year-old boy who was kidnapped in 1793 and escaped over two years later.

One man's vision and a labor of love of many.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

One of America's most historic homes also holds a startling literary legacy.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

The poems Nathaniel Hawthorne and his wife Sophia etched into its windows are still visible today.

The Wright Tavern is possibly the most important building in Concord Massachusetts to the American Revolution.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

An interesting look into 18th-century American history.

A monument to the military service of America's greatest traitor refuses to even name him.

A monument to a Polish general who fought the American Revolution and became the "Father of the American Cavalry."

The seat of Buffalo government is a gorgeous Art Deco palace.