The surviving pieces of an ancient aqueduct that may have fed into the lost Hanging Gardens of Babylon.

A 2200 year old vessel may have been able to keep a charge.

Giant reed houses made in the marshes of Southern Iraq.

The sacred shrine of the Yazidis.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

9th century Abbasid mosque, damaged in modern warfare.

Celebrated as a center of civilization, the remains of the ancient city have been nearly destroyed by greed, egoism, and war.

This remnant of an ancient Persian city is considered to be the world's largest single-span brick vault arch.

A watercolor recreation of a famous fresco unearthed at Pompeii.

One of the most well-preserved temples of ancient Egypt.

Ancient Egyptian relief, claimed to depict an electrical light.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

Nobody knows what this saucer-like ancient Egyptian object was for.

The largest known Ancient Egyptian obelisk.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

The 28,000-year-old specimen is remarkably intact.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

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

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 "lovely red Vega" of the legendary record-settling pilot.

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

A haunting tribute to pioneering photographer Clover Adams.

Home to items never before seen by the public.