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1:02
Khrushchev and his entourage tour the monuments and landmarks of Washington, DC.

3:41
Sergei Khrushchev's home video of his 1959 trip to the US with his father Nikita.

11:11
Sergei Khrushchev's home movies of his trip to NYC in 1959 with his father Nikita.

2:17
Tunneling under the Hudson river proved easy, but the East River was becoming a nightmare.

2:03
Measurements showed that the Pennsylvania RR Hudson River tunnels were shifting.

2:06
The Pennsylvania Railroad announced they would be tunneling into Manhattan.

3:00
Behind the scenes at the country's busiest transportation hub - NYC's Penn Station.

2:14
The masonry work on Pennsylvania Station began in 1908.

8:09
An exclusive look at New York MTA's subterranean East Side Access project.

0:48
Construction began in January 1933. Workers excavated 3 1/4 million cubic feet of dirt.

0:57
The south tower of the Golden Gate Bridge was built over a thousand feet into open ocean.

0:59
Joseph Strauss hired Irving Morrow to design an architectural treatment for the bridge.