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

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

Once the largest public hospital for the mentally ill was also surrounded by controversy.

Each August, one of the largest religious (and food) celebrations in the country is held in Boston.

One of the indelible moments of the American Revolution took place at this location.

This tall Massachusetts folly got its name thanks to all of the purple prose its vistas inspired.

The site of Paul Revere's historic two lantern warning.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This massive swimming pool is the high tech home to the human-powered submarine races.

It's a repurposed treasure trove of history, located just an hour away from Acadia National Park.

The only remaining historic maritime signal station in the United States.

America's most famous piece of self-built architecture.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Before it was abandoned and left to rust alongside the road, this riverboat starred in a John Wayne movie.

Museum dedicated to the preservation of surf culture.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Opened in 1976, this monster-sized version of the fast-food franchise is sometimes called the Epic McD.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Considered by many to be one of the most dangerous highways in Alaska.

This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

The facade of this 16th-century building is decorated with carvings of 300 seashells.