This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

You can row a boat through this ancient underground reservoir.

This shifting North Carolina sand dune is an odd little desert surrounded by oceanic forest life.

The house where John Wilkes Booth conspired with his co-conspirators.

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

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

Home to items never before seen by the public.

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

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

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

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

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.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

The national park was once a plantation estate.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A priceless collection of the Nation's cryptologic history.

In Egypt's expanding metro area, many of the neighbors are dead.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

This subterranean funicular is one of the world's smallest subways.

This nightmarish children's plaything was left grotesque to help kids conquer their fear.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

A "miracle" that seems to produce more holy fistfights than holy revelations.