A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

This landmark cemetery in Boston was created more than 300 years ago.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

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

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

A young botanist's horticultural vision realized through a lifetime of planting, tending, and collecting seeds.

This giant temperature attraction created some giant electric bills.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

Four hundred granite steps were built into this massive rock by the National Park Service.

Quite simply the largest tree in the world (by volume).

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

One woman's Viking Castle on Lake Tahoe.

Special tunnels built so that frogs won't be killed when crossing the highway.

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A chain of bells connect the California Missions and honor the legend of the "King’s Highway."