The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

A daily replay of the experiment that proved the rotation of the Earth.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

Largest Roman Catholic church in North America.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

The neighborhood church casts a breast-shaped shadow that locals have come to call the “two o’clock titty.”

One of the oldest producers of hand-folded fortune cookies still uses its original secret recipe.

These WWII-era murals were initially booed as a libelous portrayal of the American dream but have survived multiple attempts to have them destroyed.

This painted marvel is San Francisco's 400-foot ode to urban biking.

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

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

A morbid piece of memorabilia from the most famous shipwreck in current history is just one of the many poignant artifacts in this Canadian museum's collection.

The city of Halifax still bears the scars of the largest explosion prior to the atomic bomb.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.