Go inside to really appreciate this 500-year-old technological masterpiece.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A 16th-century horror show built in a lovely Italian garden.

This was one of the first (and last) university-built and operated nuclear reactors.

This neighborhood grocery houses a treasure trove of Eastern European delights.

This giant boulder is sandwiched between apartment complexes in upper Manhattan.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

“Invented in Key West, Perfected in Brooklyn."

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Sniff the Titan Arum's rotting flesh.

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

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

The world's largest carnivore sanctuary is home to over 450 meat-eating rescues.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.