Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Statue commemorating the use of ether in anesthesia.

A beacon atop a downtown building provides Bostonians with weather forecasts and baseball news.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

Commemorating the 1948 creation of the Jimmy Fund, a Boston-based cancer charity.

This impressive Boston holy house is the American mecca for Christian scientists.

Two thousand artifacts from around the world collected by one woman who loved to travel.

An enormous, inside-out glass globe built in 1935.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

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

Harry Houdini plunged into the Charles River and performed one of his escape acts here in 1908.

One of the now-less-hidden floral gems of the "Emerald Necklace."

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

One of the oldest still-working clocks in the world sits on an ancient tower.

Two stone columns flank the grand Venice square, but there were supposed to be three.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

A charming beach town in Turkey captures all the colors of the rainbow.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

This stone tower was built to protect Crete from incoming pirates.

One of the best-preserved medieval streets in Europe.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.