A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A super-sized promotional trick that is now a D.C. landmark.

The first purpose-built art gallery in the United States is once again open as a center of craft arts.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

The national park was once a plantation estate.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Washington's iconic carousel has a nice piece of Civil Rights history.

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

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The oldest continuously operating fish market in the United States.

Perhaps the most scandalous statue of America's first president.

Go take a picture with the inventor of the daguerreotype photographic process.

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

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Seven ceramic sculptures are scattered around this California college campus.

Pillars made of 700 pieces of luggage climb to the ceiling of Sacramento Airport's baggage claim.

The California capital city once stood 10 feet lower than it does today.

An expansive and intricately restored mansion remains from over a century ago--and so do its ghosts.