The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Time travel with sweets across history at this research-based candy store.

Built in the 1850s, this church was of the first five churches constructed in Harper's Ferry.

This shale formation along the Appalachian Trail once inspired the third president of the United States.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The only Leonardo Da Vinci painting in the Western Hemisphere.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

This whimsical stacked cabin looks like something out of a children's book.

This abandoned mine offers a glimpse at what life was like for those who came to Alaska seeking Gold Rush riches.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

A private home built to resemble the shape of a microscopic creature.

The second building of its name to occupy this location might be the finest flatiron building in San Francisco.

Radioactivity still cause for concern at this urban explorer's paradise.

This colorful boulder serves as a canvas for political statements and artistic expression.

A classic advertising icon immortalized in regal bronze.

Prone to disastrous fires, the city of San Francisco has the Guardian, a fireboat gifted by residents, to watch over them from the bay.

A man-made island in scenic San Francisco Bay.

Condemned US Navy seaplane control tower turned officers’ club sits atop Yerba Buena Island.

One time home to turn of the century explosives, now hidden under the Bay Bridge.