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

The narrowest street in Paris.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.

This classic red schoolhouse is said to have been where Mary and her little lamb went to school.

The oldest continuously-operated inn in the United States, once owned by Henry Ford.

This railroad tunnel was once the longest in Massachusetts.

Once the largest gravity dam in the world.

This piece of peacetime naval wreckage memorializes the tragic sinking of the USS Maine--an event which sparked the Spanish-American war.

One of the largest public collection of historic armored and military vehicles in North America.

"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."

Grave of the man allegedly responsible for a series of infamous murders in Boston in the 1960s.

Five mythical trolls have taken up residence in woods and hidden on paths at the Coastal Maine Botanical Gardens.

Cryptid lake monster honored with its own monument.

Explore the dark underground corridors of this graffiti-covered former military fortification.

The world's oldest and largest museum of mass transit vehicles.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

The classic Christmas carol was written at this Massachusetts tavern in 1850.

Massachusetts memorial to murder victim Elizabeth Short near the spot where she was born.

Dedicated to "the father of U.S. life insurance."

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

Civil War Fort on an island in the Boston Harbor.

A replica of fossils believed to be the first scientifically-described dinosaur bones found in North America.

Last church of this militaristic WWII style.