The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

This forgotten boat elevator was an engineering marvel in its heyday.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

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

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

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

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